SM6FHZ 5 step septum solution from 1296 up to ... - Ok1dfc.com

A Novel 5 Step SeptumFeed SuiteSwedish EME-meeting May 2013SM6FHZ and SM6PGPUpdated Post Conference Issue

Outline• Prerequisite• Features• Design criteria / considerations– Wave Guides– Septum– Kumar choke, size, position etc– Probes• Performance overview• 23 cm 0.71 L W/G feed performance– Mechanical dimensions (for each feed)– Detailed information (for each feed)• 23 cm 0.795 L W/G feed performance• 9 cm 0.748 L W/G feed performance• 6 cm 0.749 L W/G feed performance• 3 cm 0.692 L W/G feed performance• 3 cm 0.795 L W/G feed performance• Realization• On the air experience• Lessons Learned• ConclusionsSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 2

Prerequisite• I was in need for a new 23 cm feed to retrofit my 30 year old, ill builtand corroded W2IMU feed. Then a need for feeds for the higherbands arose. What to do about that?• Several existing 23 cm designs were available. I felt theperformance had a potential to be improved with properoptimization using contemporary EM-simulation S/W• Focus was put on f/D 0.32 to 0.42 (my 5.5 m dish is 0.37 f/D)• N2UO adaptation of the W2IMU Dual Mode feed satisfies the needin the area of f/D’s from ~0.42 to ~0.55• The existing feeds for higher bands are mostly scaled versions of23 cm feeds. I saw a opening for feeds specifically designed andoptimized for the specific band to get the best possible performance• I have learnt a lot about septums, chokes and wave guides alongthe way and have had a lot of fun and been frustrated as well attimesSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 3

Features• Two 23 cm 5 step septum feeds for different f/Dranges• 9, 6 and 3 cm feeds from standard metricplumbing copper or brass tubes• Unprecedented top notch performance• Focus on easy manufacturing and low tolerancesensitivity• Suitable for f/D’s ranging from 0.32 to 0.42• The two 3 cm feeds cover both 10368 and10450 MHz• All comprising a Kumar choke structureSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 4

Design criteria• We strive for– Optimum amplitude feed pattern– Flat phase response across the full dish surface (small phase errors)– Low axial ratio across the full dish surface (low cross polarization)• We can not get all of this optimized at the same time, so we have tolook for the best compromise.• The W1GHZ feed efficiency evaluation S/W “Phase_CP” has beenused for this evaluation.– This means that these results can be compared to the results of otherfeeds evaluated using the same S/W.– Phase_CP is the latest version of Pauls evaluation S/W and takesCross Polar Radiation as well as radiation in the diagonal cuts intoconsideration for the performance calculation. The earlier version didnot do that. This gives a more correct picture of the performance ofeach feed.– Phase_CP can be used for both circularly and linearly polarized feedswith great successSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 5

Wave Guide modes• The lowest mode that propagate in acircular WG is called TE11.E-fieldH-fieldSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 6

Wave Guide size and λg (10368 MHz)/ λc for TE111% change in WGdiameter => 3%change in λgSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 7

Septum considerations• The septum shall generate a circularly polarizedwave in a way that it contains only onepolarization direction in each port.This ensures that we have– Good Axial Ratio– Low Cross Polar Radiation• It shall also ensure good isolation between thetwo ports, Tx and Rx• It shall do this over a reasonable band width• In these designs this is accomplished by using a5 step septum plateSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 8

E-field variation over a full cycleSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 9

Feed without choke• No beam shaping in Co-pol• High Cross-pol level in 180 deg• Mediocre efficiency• High noise temperatureSM6FHZFF Pattern Phi=0 degSM6FHZ_23_Septum_134_no_choke ANSOFT10.00m1Name X Ym1 0.0000 7.6394m2 -68.0000 -0.9342-0.00m3 68.0000 -0.8853m4 -82.0000 -3.3133m2m3m5 82.0000 -3.2080m4m5-10.00Y1-20.00-30.00-40.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' ...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 10

Why a Kumar choke?• The Kumar choke is a efficient yet simple way of shapingthe radiation pattern of the feed.• It was first described by Dr. A. Kumar [ Reduce Cross-Polarization InReflector-Type Antennas, Microwaves, March 1978 ] and has been used by VE4MAin his feed designs.• It has some limitations and interactions with the otherparts of the feed.– The Axial Ratio at angular offsets from bore sight is controlled bythe choke– The Return Loss and Isolation is not affected by the choke– The radiation pattern can be controlled by the position and the sizeof the choke• Less elaborate than the Scalar choke but comparable orsuperior performance• It can be optimized using EM-simulation SW.SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 11

Septum - choke interaction4.003.00• Axial ratio optimization0.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]– The septum sets the Axial Ratio at bore siteand the choke governs the performance atangular off-sets from bore sight– The choke does not change the axial ratio atbore sight very much• A well functioning septum is essential forgetting a decent axial ratio also off boresight2.001.00SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 12

Choke impact on radiating pattern• There is a contradiction between the wanted amplitudepattern and the phase error with respect to illuminationangle• By adjusting the choke position and dimensions you canfind the best compromise• Moving the choke with respect to the W/G mouth doesnot directly scale the feed pattern for other f/D’s. There isa price to pay.• The best way to strive for optimal performance at otherf/D’s is to change the dimension of the W/G mouth• There are limitations on how much you can change thedimension of the W/G and maintaining the same W/Gpropagation mode• W2IMU uses this in his “Dual Mode Feed” going to ahigher mode as well as the first mode in the outer WGsectionin an controlled waySM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 13

ANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTFF Pattern quick comparisonChoke position relative WG-mouth0L-0.05L-0.1LSM6FHZ12.50Name X Ym1 0.0000 10.3940m2 -68.0000 -2.2842m3 68.0000 -1.9784m4 -82.0000 -7.6717m5 82.0000 -7.5298FF Pattern Phi=0 degm1VE4MA_super_SM6FHZ_flushSM6FHZ10.00-0.00Name X Ym1 0.0000 6.1216m2 -68.0000 -0.6794m3 68.0000 -0.8165m4 -82.0000 -6.1889m5 82.0000 -6.2581m2FF Pattern Phi=0 degm1m3VE4MA_super_SM6FHZ_05SM6FHZ10.00-0.00Name X Ym1 0.0000 2.0227m2 -68.0000 -0.2910m3 68.0000 -0.1526m4 -82.0000 -5.4300m5 82.0000 -5.3609m2FF Pattern Phi=0 degm1m3VE4MA_super_SM6FHZ_100.00m2m3m4m5m4m5-10.00-10.00m4m5Y1-12.50Y1-20.00Y1-20.00-30.00-30.00-25.00-37.50SM6FHZ10.00-0.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-0.15LFF Pattern Phi=0 degVE4MA_super_SM6FHZ_3Name X Ym1 0.0000 1.7894m2 -68.0000 -0.0838m3 68.0000 0.0025m1m4 -82.0000 -4.6043m2m3m5 82.0000 -4.7944m4m5Curve Info-40.00dB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-0.18LSM6FHZFF Pattern Phi=0 degVE4MA_super_SM6FHZ_1810.00Name X Ym1 0.0000 3.4122m2 -68.0000 0.0698m3 68.0000 -0.2388m1m4 -82.0000 -4.3216m5 82.0000 -4.1282m2m30.00m4m5-40.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-0.2LSM6FHZFF Pattern Phi=0 degVE4MA_super_SM6FHZ_2010.00Name X Ym1m1 0.0000 4.6926m2 -68.0000 0.1335m2m3m3 68.0000 -0.30910.00m4 -82.0000 -4.1734m4m5 82.0000 -4.3113m5-10.00-10.00-10.00-20.00Y1-20.00Y1Y1-20.00-30.00-30.00-40.00-40.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-30.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-40.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-50.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-60.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]-0.25L-0.3LSM6FHZ10.00FF Pattern Phi=0 degVE4MA_super_SM6FHZ_25SM6FHZ10.00FF Pattern Phi=0 degm1VE4MA_super_SM6FHZ_30m1Name X Y0.00m1 0.0000 7.1046m2 -68.0000 -0.3564m3 68.0000 -0.1684m4 -82.0000 -3.7806m5 82.0000 -3.9911m2m3-0.00Name X Ym1 0.0000 8.6614m2 -68.0000 -1.0586m3 68.0000 -0.2887m4 -82.0000 -3.4487m5 82.0000 -3.6794m4m2m3m5m4m5-10.00-10.00Y1Y1-20.00-20.00-30.00-30.00-40.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...Theta [deg]SM6FHZ 2013-06-16Rev B-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Curve Info-40.00dB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]Swedish EME-meeting May 2013 14

ANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTFF Phase error quick comparisonChoke position relative WG-mouth0L-0.05L-0.1LSM6FHZ-100.00FF Phase Phi=0 degVE4MA_super_SM6FHZ_flushSM6FHZ-50.00Name X Ym1 0.0000 -182.4185m2 -70.0000 -119.1039FF Phase Phi=0 degVE4MA_super_SM6FHZ_05Curve Infocang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...SM6FHZ-50.00Name X Ym1 0.0000 -167.7911m2 -70.0000 -124.9014FF Phase Phi=0 degVE4MA_super_SM6FHZ_10Curve Infocang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...-75.00-75.00-120.00-100.00-100.00cang_deg(rERHCP) [deg]-140.00-160.00cang_deg(rERHCP) [deg]-125.00m2cang_deg(rERHCP) [deg]-125.00m2-150.00-150.00m1-180.00Curve Infocang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...-175.00Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y)d( m1 ,m2 ) -70.0000 63.3146 -0.9045 -1.1056m1-175.00-200.00-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]-200.00-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y)-200.00d( m1 ,m2 ) -70.0000 42.8897 -0.6127 -1.6321-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]-0.15L-0.18L-0.2LSM6FHZ-100.00FF Phase Phi=0 degCurve InfoVE4MA_super_SM6FHZ_3SM6FHZ-50.00FF Phase Phi=0 degCurve InfoVE4MA_super_SM6FHZ_18SM6FHZ-50.00FF Phase Phi=0 degCurve InfoVE4MA_super_SM6FHZ_20cang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...Name X Ycang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...cang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...-75.00m1 0.0000 -119.9562m2 -34.0000 -141.9219-75.00Name X Ym1 0.0000 -116.4200m2 -70.0000 -132.7457-110.00-100.00-100.00cang_deg(rERHCP) [deg]-120.00-130.00cang_deg(rERHCP) [deg]-125.00m2m1cang_deg(rERHCP) [deg]-125.00m2m1-150.00-150.00-140.00-175.00-175.00Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y)d( m1 ,m2 ) -34.0000 -21.9657 0.6460 1.5479-150.00-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]-200.00-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y)-200.00d( m1 ,m2 ) -70.0000 -16.3257 0.2332 4.2877-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Theta [deg]SM6FHZ-50.00-0.25LFF Phase Phi=0 degCurve InfoVE4MA_super_SM6FHZ_25SM6FHZ-50.00-0.30LFF Phase Phi=0 degCurve InfoVE4MA_super_SM6FHZ_30Name X Ym1 0.0000 -116.4925m2 -70.0000 -132.8091cang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...Name X Ym1 0.0000 -123.5121m2 -70.0000 -134.3548cang_deg(rERHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' Phi='0deg' Sept2_h='-11...-75.00-75.00-100.00-100.00cang_deg(rERHCP) [deg]-125.00m2m1cang_deg(rERHCP) [deg]-125.00m2m1-150.00-150.00-175.00-175.00SM6FHZ 2013-06-16Theta [deg]Rev BName Delta(X) Delta(Y) Slope(Y) InvSlope(Y)-200.00d( m1 ,m2 ) -70.0000 -16.3165 0.2331 4.2901-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00-200.00Name Delta(X) Delta(Y) Slope(Y) InvSlope(Y)d( m1 ,m2 ) -70.0000 -10.8427 0.1549 6.4560-100.00 -75.00 -50.00 -25.00 0.00 25.00 50.00 75.00 100.00Swedish EME-meeting Theta [deg] May 2013 15

ANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTANSOFTAxial Ratio quick comparisonChoke position relative WG-mouthSM6FHZ12.0010.008.000LAxialRatioVE4MA_super_SM6FHZ_flushCurve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...SM6FHZ6.005.004.00-0.05LAxialRatioVE4MA_super_SM6FHZ_05Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...SM6FHZ6.005.004.00-0.1LAxialRatioVE4MA_super_SM6FHZ_10Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...dB(AxialRatioValue)6.00dB(AxialRatioValue)3.00dB(AxialRatioValue)3.004.002.002.001.001.002.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]0.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]0.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]-0.15L-0.18L-0.2LSM6FHZ4.003.503.00AxialRatioVE4MA_super_SM6FHZ_3Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...SM6FHZ6.005.004.00AxialRatioVE4MA_super_SM6FHZ_18Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...SM6FHZ6.005.004.00AxialRatioVE4MA_super_SM6FHZ_20Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...2.50dB(AxialRatioValue)2.00dB(AxialRatioValue)3.00dB(AxialRatioValue)3.001.502.002.001.001.001.000.500.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]0.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]0.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]-0.25L-0.3LSM6FHZ6.005.004.00AxialRatioVE4MA_super_SM6FHZ_25Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...SM6FHZ6.005.004.00AxialRatioVE4MA_super_SM6FHZ_30Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-180deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_len...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='-45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_lengt...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_h='-25.4mm' WG_length...dB(AxialRatioValue)3.00dB(AxialRatioValue)3.002.002.001.000.00SM6FHZ 2013-06-16Theta [deg]Rev B-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.001.00Swedish EME-meeting May 2013 160.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]

Putting the Feed in a DishDish Reflexion• Pointing your feed into the dish will resultin a reflected wave from the dish enteringthe feed.• The level of the reflexion coefficient (Γ) willbe dependant on the gain of the feed (G),lambda (λ) , and the focal length of thedish (f).SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 17

Putting the Feed in a DishDish Reflexion• How bad can it get?– With a linear feed you will see the reflected wave on the Tx port but with a circularpolarized feed the reflected wave will show up in the Rx port due to the phasereversal upon the reflexion in the dish surface. This affects the isolation between Txand Rx.– 1296 MHz, VE4MA type feed in a 5.5m, 0.37 f/D dish will result in 29 dB RL.– 1296 MHz, W2IMU type feed in a 8m, 0.45 f/D dish will result in 26 dB RL.– 5760 MHz, VE4MA type feed in a 5.5m, 0.37 f/D dish will result in >40 dB RL.– 5760 MHz, VE4MA type feed in a 2m, 0.37 f/D dish will result in 33 dB RL.– 10368 MHz, VE4MA type feed in a 5.5m, 0.37 f/D dish will result in 47 dB RL.– 10368 MHz, VE4MA type feed in a 2m, 0.37 f/D dish will result in 38 dB RL.• A spread-sheet can be found on my web page for your own further testing.• RA3AQ proposes using a small metal coin in the centre of the feed aperture inorder to fine tune the isolation in situ. This need to be done specifically for eachinstallation but can yield excellent isolation over a narrow frequency band• Summary.– This reflexion is not a major problem on the higher bands on larger dishes.– If the reflexion is down below the 30 dB RL region you may consider to address it.SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 18

InDish PerformanceA quick look at all 5 feeds

InDish Performance 3 cm (1.8 m dish)3 cm 0.692 L W/G feed performance 3 cm 0.795 L W/G feed performanceSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 22

SM6FHZ 23 cm 5 step septumfeed0.71 lambda W/G

Solid and transparent models from thesimulationSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 24

WG and choke dimensionsPhase center -5.031Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.105.0outerT= 0.5 wallT= 1.0 bottomTxLHCPRxRHCP444.0 outerWave guide165/164 mmcopper tube654 outer1.0 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 25

Septum dimensions45.696.524.429.4Wave guide165/164 mmcopper tube68.862.820.375.7117.639.1Septumt = 0.8 mmcopper177.8Inner measureBottomplate notincluded164.0Bottom plate1.0 mmcopperSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 26

Probe dimensions4.0 diam.51.340.7innerSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 27

S11, S22, S21 combinedSM6FHZ-5.00-10.00-15.00Name X Ym1 1.2960 -33.7345m2 1.2960 -41.2471S11, S22 and S21 combined SM6FHZ_23_Septum_134_4ANSOFTCurve InfodB(S(WavePort1,WavePort1))Setup1 : Sw eep1Prob_pos='-697.3mm'dB(S(WavePort2,WavePort2))Setup1 : Sw eep1Prob_pos='-697.3mm'dB(S(WavePort2,WavePort1))Setup1 : Sw eep1Prob_pos='-697.3mm'-20.00Y1-25.00-30.00m1-35.00-40.00m2-45.001.25 1.27 1.30 1.33 1.35Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 28

3D Total Power Far Field patternSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 29

Far Field Pattern 0 degSM6FHZ10.00FF Pattern Phi=0 degSM6FHZ_23_Septum_134_4ANSOFTName X Y0.00m1 0.0000 1.1456m2 -68.0000 -0.0737m3 68.0000 -0.0693m4 -82.0000 -5.0790m5 82.0000 -5.0498m4m2m1m3m5-10.00-20.00Y1-30.00-40.00-50.00-60.00Curve InfodB(DirRHCP)Setup1 : LastAdaptive$Prob1D='3mm' $Prob1L='-53.55352329mm' $Prob2D='3mm' $Prob2L='54mm' $ProbPos='-686mm' Freq='1.296GHz' ...dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...-70.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 30

Far Field Phase errorSM6FHZ180.00170.00FF Phase Theta PhiSM6FHZ_23_Septum_134_4Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Prob_pos='-697.3mm'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg' Prob_pos='-697.3mm'ANSOFT160.00150.00Y1 [deg]140.00130.00120.00110.00100.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 31

Cross Polar RatioSM6FHZ0.00-10.00dB(PolarizationRatioCircularLHCP)-20.00-30.00-40.00Cross Polarization RatioCurve InfoSM6FHZ_23_Septum_134_4dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6...ANSOFT-50.00-60.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 32

Axial RatioSM6FHZ8.007.006.00AxialRatioCurve InfoSM6FHZ_23_Septum_134_4dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='45deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6_...dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='135deg' Sept2_h='-118.6mm' Sept3_h='-76.7mm' Sept4_h='-40.1mm' Sept5_h='-30.4mm' Sept6...ANSOFT5.00dB(AxialRatioValue)4.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 33



WG and choke dimensionsPhase center 4.021Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.TxLHCP117 outerRxRHCP460 outerWave guide186/184 mmcopper tubeT= 0.5 wallT= 1.0 bottom670 outer1.0 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 36



S11, S22, S21 combinedSM6FHZ-5.00-10.00-15.00Name X Ym1 1.2960 -24.7909m2 1.2960 -31.8574m3 1.2960 -34.2555S11, S22 and S21 combined SM6FHZ_septum_23_18_4ANSOFTCurve InfodB(S(1,1))Setup1 : Sw eepProb_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm'dB(S(2,2))Setup1 : Sw eepProb_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm'dB(S(2,1))Setup1 : Sw eepProb_pos='-686.2mm' Sept2_h='-146mm' Sept4_h='-64mm' Sept5_h='-35mm' Sept6_h='-22.95mm'-20.00Y1-25.00m1-30.00m2-35.00m3-40.00-45.001.20 1.23 1.25 1.28 1.30 1.33 1.35 1.38 1.40Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 39

Complex impedance Rx-portSM6FHZSmith Chart Rx-portSM6FHZ_septum_23_18_4ANSOFTName Freq Ang Mag RXm1 1.2970 123.2444 0.0255 0.9715 + 0.0415i120110100901.00807060Curve InfoS(2,2)Setup1 : Sw eep1300.502.005014040150301600.205.0020170100.001800.000.200.50m11.002.005.000-170-10-160-0.20-5.00-20-150-30-140-40-130-0.50-2.00-50SM6FHZ 2013-06-16Rev B-120-60-110-1.00-70-100 -90 -80Swedish EME-meeting May 2013 40


Far Field Pattern 0 degSM6FHZ10.000.00FF Pattern, Phi=0 degSM6FHZ_septum_23_18_4Curve InfodB(DirRHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg'dB(DirLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg'ANSOFT-10.00-20.00Y1-30.00-40.00-50.00-60.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 42

Far Field Phase errorSM6FHZ50.0040.0030.00FF Phase errorSM6FHZ_septum_23_18_4Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg'ANSOFT20.0010.00Y1 [deg]0.00-10.00-20.00-30.00-40.00-50.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 43

SM6FHZ0.00-10.00Cross Polar RatioFF Cross Polar RatioSM6FHZ_septum_23_18_4Curve InfodB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg'dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='45deg'dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg'dB(PolarizationRatioCircularLHCP)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='135deg'ANSOFTdB(PolarizationRatioCircularLHCP)-20.00-30.00-40.00-50.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 44

SM6FHZ8.007.006.00Axial RatioFF Axial RatioSM6FHZ_septum_23_18_4Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='1.296GHz' Phi='135deg'ANSOFT5.00dB(AxialRatioValue)4.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 45


ModelSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 47

Transparent modelSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 48

WG and choke dimensionsPhase center 2.011Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.43.5outerT= 0.5 wallT= 1.0 bottom176.4 outer218.7outer0.5 mm bottomplate includedTxLHCPRxRHCPWave guide70/66 mmcopper tubeSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 49

Septum dimensions2225.912.316.1Wave guide70/66 mmcopper tube21.517.11053.635.023.0Septumt = 1.0 mmcopper63.1Inner measureBottomplate notincluded66.0Bottom plate0.5 mmcopperSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 50


FF 3D Total Power patternSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 52

FF Directivity patternSM6FHZ10.000.00Directivity_Phi90SM6FHZ_septum_feed_w_choke6Curve InfodB(DirLHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='90deg'dB(DirRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='90deg'ANSOFT-10.00-20.00Y1-30.00-40.00-50.00-60.00-70.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 53

S11, S22 and S21 combinedSM6FHZ-5.00-10.00S11, S22 and S21 combined SM6FHZ_septum_feed_w_choke6ANSOFTCurve InfodB(S(RxPort,RxPort))Setup1 : Sw eepdB(S(TxPort,TxPort))Setup1 : Sw eepdB(S(TxPort,RxPort))Setup1 : Sw eep-15.00Name X Ym1 3.4000 -41.3097m2 3.4000 -39.1830-20.00Y1-25.00-30.00-35.00m2-40.00m1-45.003.10 3.20 3.30 3.40 3.50 3.60 3.70Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 54

Complex impedance Rx-portName Freq Ang Mag RXm1 3.7000 16.6154 0.1253 1.2692 + 0.0924im2 3.4000 -73.3845 0.0110 1.0061 - 0.0212im3 3.2000 117.7322 0.2570 0.7156 + 0.3485im4 3.1000 151.0225 0.4496 0.4012 + 0.2191i120110Rx_port_imp10090801.007060SM6FHZ_septum_feed_w_choke6Curve InfoS(RxPort,RxPort)Setup1 : Sw eepANSOFT1300.502.005014040150301600.205.0020m4m3170100.001800.000.200.50m21.00m12.005.000-170-10-160-0.20-5.00-20-150-30-140-40-130-0.50-2.00-50-120-60-110-1.00-100 -90 -80-70SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 55

FF Phase errorSM6FHZ0.00-10.00-20.00FF Phase ErrorSM6FHZ_septum_feed_w_choke6Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='0deg'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='90deg'ANSOFT-30.00-40.00Y1 [deg]-50.00-60.00-70.00-80.00-90.00-100.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 56

Cross Polarization RatioSM6FHZ0.00-10.00dB(PolarizationRatioCircularRHCP)-20.00-30.00-40.00PolarizationRatioSM6FHZ_septum_feed_w_choke6Curve InfodB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='0deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='45deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='90deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='135deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='180deg'ANSOFT-50.00-60.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 57

Axial RatioSM6FHZ10.009.008.007.00AxialRatioSM6FHZ_septum_feed_w_choke6Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='135deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='3.4GHz' Phi='180deg'ANSOFT6.00dB(AxialRatioValue)5.004.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 58

Realization9, 6 and 3 cm feeds comparisonSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 59

Measured performance with partialseptum solderingSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 60

Measured performanceSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 61

Measured complex impedanceReference plane about15 mm (~0.25 WL inteflon) out from thesimulated case.SMA connector on feedincluded in measurement.Measurement sweep 200MHz wider thansimulation sweepVery good agreementbetween simulated andmeasured performance.SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 62

InDish Performance, 1.8 and 2.2 m dishSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 63



WG and choke dimensions6.06.5Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.TxLHCPRx26 outerRHCP103.4 outerWave guide42/39 mmcopper tubeT= 0.5 wallT= 1.0 bottom129.5outer0.5 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 66


Probe dimensions1.34.423.5 diam.10.811.0innerSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 68

FF 3D Total Power patternSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 69

FF Directivity patternSM6FHZ10.00-0.00Directivity_Phi90SM6FHZ_septum_feed_w_choke_42_22Curve InfodB(DirLHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='90deg'dB(DirRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='90deg'ANSOFT-10.00Y1-20.00-30.00-40.00-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 70

S11, S22 and S21 combinedSM6FHZ-5.00-10.00Name X Ym1 5.7600 -34.6809m2 5.7600 -31.0802S11, S22 and S21 combined SM6FHZ_septum_feed_w_choke_42_22ANSOFTCurve InfodB(S(RxPort,RxPort))Setup1 : Sw eepdB(S(TxPort,TxPort))Setup1 : Sw eepdB(S(TxPort,RxPort))Setup1 : Sw eep-15.00Y1-20.00-25.00-30.00m2-35.005.40 5.50 5.60 5.70 5.80 5.90Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 71m1

Complex impedance Rx-portName Freq Ang Mag RXm1 5.5950 16.9581 0.1139 1.2414 + 0.0836im2 5.6900 -15.5465 0.0432 1.0866 - 0.0252im3 5.7850 -131.4701 0.0212 0.9719 - 0.0308im4 5.9000 159.2115 0.0512 0.9081 + 0.0331i120110Smith Chart 110090801.007060SM6FHZ_septum_feed_w_choke_42_22Curve InfoS(RxPort,RxPort)Setup1 : Sw eepANSOFT1300.502.005014040150301600.205.0020170100.001800.000.200.50m4m1m31.00m22.005.000-170-10-160-0.20-5.00-20-150-30-140-40-130-0.50-2.00-50SM6FHZ 2013-06-16Rev B-120-60-110-1.00-70-100 -90 -80Swedish EME-meeting May 2013 72

MeasurementsSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 73

FF Phase errorSM6FHZ0.00-10.00-20.00FF_phase_combinedSM6FHZ_septum_feed_w_choke_42_22Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='0deg'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='90deg'ANSOFT-30.00-40.00-50.00-60.00Y1 [deg]-70.00-80.00-90.00-100.00-110.00-120.00-130.00-140.00-150.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 74

Cross Polarization RatioSM6FHZ10.00-0.00dB(PolarizationRatioCircularRHCP)-10.00-20.00-30.00PolarizationRatioSM6FHZ_septum_feed_w_choke_42_22Curve InfodB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='0deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='45deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='90deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='135deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='180deg'ANSOFT-40.00-50.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 75

Axial RatioSM6FHZ10.009.008.007.00AxialRatioSM6FHZ_septum_feed_w_choke_42_22Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='135deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='5.76GHz' Phi='180deg'ANSOFTdB(AxialRatioValue)6.005.004.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 76

InDish PerformanceSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 77

RealizationSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 78



WG and choke dimensions2.03.5Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.TxLHCPRx14.4 outerRHCP57.8 outerWave guide22/20 mmcopper tubeT= 0.5 wallT= 1.0 bottom85.8outer1.0 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 81



S11, S22, S21 combinedSM6FHZ0.00-5.00S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke4ANSOFTCurve InfodB(S(RxPort,RxPort))Setup1 : Sw eepdB(S(TxPort,TxPort))Setup1 : Sw eepdB(S(TxPort,RxPort))Setup1 : Sw eep-10.00Y1-15.00-20.00Name X Ym1 10.3600 -20.8368m2 10.4600 -22.5740m3 10.3600 -25.5532m4 10.4600 -33.3663m5 10.3600 -30.3108m6 10.4600 -28.8759m1m2-25.00m3m6-30.00m5m4-35.00-40.00-45.009.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 84


Far Field Pattern 0 degSM6FHZ10.000.00Directivity_Phi0SM6FHZ_septum_feed_w_choke4Curve InfodB(DirLHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(DirRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'ANSOFT-10.00-20.00Y1-30.00-40.00-50.00-60.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 86

Far Field PhaseSM6FHZ100.00FF_phase_Phi90SM6FHZ_septum_feed_w_choke4Curve Infoang_deg(rETheta)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'ANSOFT75.0050.0025.00ang_deg(rETheta) [deg]-0.00-25.00-50.00-75.00-100.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 87

Cross Polar RatioSM6FHZ10.000.00-10.00PolarizationRatioSM6FHZ_septum_feed_w_choke4Curve InfodB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='45deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='135deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='180deg'ANSOFTdB(PolarizationRatioCircularRHCP)-20.00-30.00-40.00-50.00-60.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 88

Axial RatioSM6FHZ10.009.008.007.00AxialRatioSM6FHZ_septum_feed_w_choke4Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='135deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='180deg'ANSOFT6.00dB(AxialRatioValue)5.004.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 89

RealizationSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 90

SM6FHZ0.00-5.00+0.2 mm WG-diam, +1 mm septum,+1 mm WG-lengthS11, S22 & S21 combined SM6FHZ_septum_feed_w_choke8ANSOFTCurve InfodB(S(RxPort,RxPort))Setup1 : Sw eepdB(S(TxPort,TxPort))Setup1 : Sw eepdB(S(TxPort,RxPort))Setup1 : Sw eep-10.00m2Y1-15.00-20.00Name X Ym1 10.3600 -18.4100m2 10.4600 -14.4079m3 10.3600 -21.2322m4 10.4600 -20.0950m5 10.3600 -28.0917m6 10.4600 -19.1339m1m3m6m4-25.00m5-30.00-35.009.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 91

WG and choke dimensions2.03.5Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.TxLHCPRx14.4 outerRHCP57.8 outerWave guide22/20.2 mmcopper tubeT= 0.5 wallT= 1.0 bottom84.3outer1.0 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 92

Septum dimensions7.08.52.43.4Wave guide22/20.2 mmcopper tube7.06.04.013.710.86.0Septumt = 1.0 mmcopper24.0Inner measureBottomplate notincluded20.2Bottom plate1.0 mmcopperSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 93


20,2 mm WG-inner diam optimizedSM6FHZ0.00-5.00S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke10ANSOFTCurve InfodB(S(RxPort,RxPort))Setup1 : Sw eepdB(S(TxPort,TxPort))Setup1 : Sw eepdB(S(TxPort,RxPort))Setup1 : Sw eep-10.00Y1-15.00-20.00Name X Ym1 10.3600 -21.6527m2 10.4600 -21.6857m3 10.3600 -24.3700m4 10.4600 -21.0303m5 10.3600 -26.7751m6 10.4600 -21.7375m1m4m2 m6m3-25.00m5-30.00-35.009.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 95

MeasurementsSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 96

Far Field Pattern 0 degSM6FHZ12.500.00Directivity_Phi0SM6FHZ_septum_feed_w_choke10Curve InfodB(DirLHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(DirRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'ANSOFT-12.50-25.00Y1-37.50-50.00-62.50-75.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 97

FF Phase errorSM6FHZ0.00-10.00-20.00FF Phase errorSM6FHZ_septum_feed_w_choke10Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg' Septum3_height='-11.6mm'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg' Septum3_height='-11.6mm'ANSOFT-30.00-40.00Y1 [deg]-50.00-60.00-70.00-80.00-90.00-100.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 98

Axial RatioSM6FHZ10.00dB(AxialRatioValue)9.008.007.006.005.004.00AxialRatioSM6FHZ_septum_feed_w_choke10Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='135deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='180deg'ANSOFT3.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 99



WG and choke dimensions1.52.5Circular polarization conventionfor EME according to CrawfordHill Bulletin No 1:Tx RHCP in spaceRx LHCP in spaceTake polarization reversal intoaccount when using reflectorantennas.TxLHCPRx14.9 outerRHCP60.0 outerWave guide25/22 mmbrass tubeT= 0.5 wallT= 1.0 bottom75.3outer1.0 mm bottomplate includedSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 102

Septum dimensions7.09.31.52.5Wave guide25/22 mmbrass tube8.07.05.015.08.04.7Septumt = 1.0 mmcopper27.0Inner measureBottomplate notincluded22.0Bottom plate1.0 mmbrassSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 103


S11, S22, S21 combinedSM6FHZ-5.00-7.50-10.00Name X Ym1 10.3600 -24.0053m2 10.4600 -23.0229m3 10.3600 -22.5904m4 10.4600 -22.3300m5 10.3600 -23.2663m6 10.4600 -23.4300S11, S22 & S21 combined SM6FHZ_septum_feed_w_choke4_86_2ANSOFTCurve InfodB(S(TxPort,TxPort))Setup1 : Sw eepProbe_pos='-66mm'dB(S(RxPort,RxPort))Setup1 : Sw eepProbe_pos='-66mm'dB(S(TxPort,RxPort))Setup1 : Sw eepProbe_pos='-66mm'-12.50Y1-15.00-17.50-20.00-22.50m3m5m1m4m2m6-25.009.50 9.75 10.00 10.25 10.50 10.75 11.00 11.25 11.50Freq [GHz]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 105


Far Field Pattern 0 deg10.00-0.00Directivity_Phi0SM6FHZ_septum_feed_w_choke4_86_2Curve InfodB(DirLHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(DirRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'ANSOFT-10.00Y1-20.00-30.00-40.00-50.00-200.00 -150.00 -100.00 -50.00 0.00 50.00 100.00 150.00 200.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 107

Far Field Phase errorSM6FHZ-50.00-60.00-70.00FF Phase errorSM6FHZ_septum_feed_w_choke4_86_2Curve Infoang_deg(rEPhi)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg' Probe_pos='-66mm'ang_deg(rETheta)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg' Probe_pos='-66mm'ANSOFT-80.00-90.00Y1 [deg]-100.00-110.00-120.00-130.00-140.00-150.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 108

Cross Polar RatioSM6FHZ10.00-0.00-10.00PolarizationRatioSM6FHZ_septum_feed_w_choke4_86_2Curve InfodB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='45deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='135deg'dB(PolarizationRatioCircularRHCP)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='180deg'ANSOFTdB(PolarizationRatioCircularRHCP)-20.00-30.00-40.00-50.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 109

Axial RatioSM6FHZ10.009.008.007.00AxialRatioSM6FHZ_septum_feed_w_choke4_86_2Curve InfodB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='0deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='45deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='90deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='135deg'dB(AxialRatioValue)Setup1 : LastAdaptiveFreq='10.368GHz' Phi='180deg'ANSOFT6.00dB(AxialRatioValue)5.004.003.002.001.000.00-90.00 -80.00 -70.00 -60.00 -50.00 -40.00 -30.00 -20.00 -10.00 -0.00 10.00 20.00 30.00 40.00 50.00 60.00 70.00 80.00 90.00Theta [deg]SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 110

On the air experience 6 cm• SM6FHZ 6 cm– 17 dB sun noise and 1.1 dB moon noise.– 13 initials– Nice returns from the moon with 17 W at the feed ofthe 5.5 m solid dish• SM6PGP 6 cm– 12 dB sun noise and 0.3 dB moon noise– 9 initials– Moon returns readable with 90 W at the feed in an 1.8m solid dishSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 111

On the air experience 3 cm• SM6PGP 3 cm– 10 dB sun noise and 0.3 dB moon noise– 4 stations heard (positively identified on CW)via the moon– Antenna 1.8 m solid dishSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 112

Lessons Learned• Scaling feed dimensions from a one banddesign to another band is at your own risk– The materiel used (thickness etc) plays a importantrole. It is not obvious how to scale material thickness.I argue that you will not know what radiation patternyou will get if scaled.• Soldering of the septum to 100% is crucial– This is true for all soldering joints in the feed• The inner WG diameter is sensitive to tolerances– 0.2 mm larger diameter on 10 GHz moved theoptimum isolation >100 MHz downSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 113

Conclusion• 5 new septum feeds from 23 cm to 3 cm have beenpresented• All of them show very good performance• The feeds for 3 cm are circularly polarized as well• The 9 cm, 6 cm and 3 cm feeds are based on standardmetric Cu or brass tubes for easy manufacturing• So far three of the feeds have been built, measured andused. All of them show very good correlation betweensimulated and measured performance.SM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 114

Acknowledgements• Thanks to all who inspired me to do this workand that gave me so many good ideas:– W1GHZ, Paul– VE4MA, Barry– W2IMU, Dick– SM6PGP, Hannes– WD5AGO, Tommy– N2UO, Marc– RA3AQ, Dmitry– OK1DFC, Zdenek– Plus many othersSM6FHZ 2013-06-16Rev BSwedish EME-meeting May 2013 115

Thank you for your attentionSee you all via the moon on the higher bands

SM6FHZ 5 step septum solution from 1296 up to ... - Ok1dfc.com

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