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

More documents

Recommendations

Info

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
Page 1 and 2: A Novel 5 Step SeptumFeed SuiteSwed
Page 3 and 4: Prerequisite• I was in need for a
Page 5 and 6: Design criteria• We strive for- O
Page 7 and 8: Wave Guide size and λg (10368 MHz)
Page 9: E-field variation over a full cycle
Page 13 and 14: Choke impact on radiating pattern
Page 15 and 16: ANSOFTANSOFTANSOFTANSOFTANSOFTANSOF
Page 17 and 18: Putting the Feed in a DishDish Refl
Page 19: InDish PerformanceA quick look at a
Page 23 and 24: SM6FHZ 23 cm 5 step septumfeed0.71
Page 25 and 26: WG and choke dimensionsPhase center
Page 27 and 28: Probe dimensions4.0 diam.51.340.7in
Page 29 and 30: 3D Total Power Far Field patternSM6
Page 31 and 32: Far Field Phase errorSM6FHZ180.0017
Page 33 and 34: Axial RatioSM6FHZ8.007.006.00AxialR
Page 35 and 36: Solid and transparent models from t
Page 37 and 38: Septum dimensions45.695.722.034.0Wa
Page 39 and 40: S11, S22, S21 combinedSM6FHZ-5.00-1
Page 41 and 42: 3D Total Power Far Field patternSM6
Page 43 and 44: Far Field Phase errorSM6FHZ50.0040.
Page 45 and 46: SM6FHZ8.007.006.00Axial RatioFF Axi
Page 47 and 48: ModelSM6FHZ 2013-06-16Rev BSwedish
Page 49 and 50: WG and choke dimensionsPhase center
Page 51 and 52: Probe dimensions2.0 diam.19.116.5in
Page 53 and 54: FF Directivity patternSM6FHZ10.000.
Page 55 and 56: Complex impedance Rx-portName Freq
Page 57 and 58: Cross Polarization RatioSM6FHZ0.00-
Page 59 and 60: Realization9, 6 and 3 cm feeds comp
Page 61 and 62:
Measured performanceSM6FHZ 2013-06-
Page 63 and 64:
InDish Performance, 1.8 and 2.2 m d
Page 65 and 66:
Solid and transparent models from t
Page 67 and 68:
Septum dimensions13.015.37.09.2Wave
Page 69 and 70:
FF 3D Total Power patternSM6FHZ 201
Page 71 and 72:
S11, S22 and S21 combinedSM6FHZ-5.0
Page 73 and 74:
MeasurementsSM6FHZ 2013-06-16Rev BS
Page 75 and 76:
Cross Polarization RatioSM6FHZ10.00
Page 77 and 78:
InDish PerformanceSM6FHZ 2013-06-16
Page 79 and 80:
SM6FHZ 3 cm 5 step septumfeed0.692
Page 81 and 82:
WG and choke dimensions2.03.5Circul
Page 83 and 84:
Probe dimensions1.3 diam.5.65.0inne
Page 85 and 86:
3D Total Power Far Field patternSM6
Page 87 and 88:
Far Field PhaseSM6FHZ100.00FF_phase
Page 89 and 90:
Axial RatioSM6FHZ10.009.008.007.00A
Page 91 and 92:
SM6FHZ0.00-5.00+0.2 mm WG-diam, +1
Page 93 and 94:
Septum dimensions7.08.52.43.4Wave g
Page 95 and 96:
20,2 mm WG-inner diam optimizedSM6F
Page 97 and 98:
Far Field Pattern 0 degSM6FHZ12.500
Page 99 and 100:
Axial RatioSM6FHZ10.00dB(AxialRatio
Page 101 and 102:
Solid and transparent models from t
Page 103 and 104:
Septum dimensions7.09.31.52.5Wave g
Page 105 and 106:
S11, S22, S21 combinedSM6FHZ-5.00-7
Page 107 and 108:
Far Field Pattern 0 deg10.00-0.00Di
Page 109 and 110:
Cross Polar RatioSM6FHZ10.00-0.00-1
Page 111 and 112:
On the air experience 6 cm• SM6FH
Page 113 and 114:
Lessons Learned• Scaling feed dim
Page 115 and 116:
Acknowledgements• Thanks to all w
show all

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

Create successful ePaper yourself

Delete template?

Save as template?