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Radiation pattern The radiation pattern is shown for φ=0 o and φ=90 o in the figure below Gain Figure 7.8 Radiation Pattern A gain of 6.7 db is achieved at the center frequency as shown in the figure. The results show a very wide beam width and a gain or around 5 dB at ±35 o . However the cross polar level is a bit high which will affect the circular polarization. Figure 7.9 Gain(blue) and Cross Polarization(pink) 64
Axial Ratio The axial ratio plot is shown in the figure below and is a little bit high due to the high cross polarization level. 7.4 U Parasitic Antenna Figure 7.10 Axial Ratio The U parasitic Antenna is shown in the figure below. It consists of two u shaped parasitic patches and a rectangular patch in the center. The antenna used an FR4 substrate with a thickness of 4 mm which was one of the main reasons it was not manufactured. This antenna is linearly polarized, however a technique might have been used to excite the circular polarization however the substrate thickness of 4 mm made it a really expensive choice. Figure 7.11 U Parasitic Antenna 65
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Master Thesis Design of Microstrip
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Chapter 4 3.1 Introduction………
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Acknowledgement I would like to exp
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1.1 Kapsch TrafficCom Chapter 1 Ove
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The On-‐Board Units above provi
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2.1 Introduction Chapter 2 Introduc
Page 13 and 14: Since this notation frequently caus
Page 15 and 16: 2.5 Antenna Parameters Figure 2.5 A
Page 17 and 18: 2.5.3 Return Loss Return loss is an
Page 19 and 20: 2.5.7 Conversion Gain The conversio
Page 21 and 22: However when the design was optimiz
Page 23 and 24: It can be seen that radiation patte
Page 25 and 26: Similarly, the axial ratio from HFS
Page 27 and 28: Cross Polarization The cross polari
Page 29 and 30: Figure 4.1 (b) Side view of the ant
Page 31 and 32: Gain Figure 4.5 Radiation Pattern f
Page 33 and 34: Similarly axial ratio from HFSS is
Page 35 and 36: Cross polarization Cross polarizati
Page 37 and 38: 5.1 Introduction Chapter 5 Patch An
Page 39 and 40: Similarly return loss in HFSS is sh
Page 41 and 42: Axial Ratio Figure 5.7 Gain (RHCP a
Page 43 and 44: 5.3.2 Measured Results Different me
Page 45 and 46: 6.1 Introduction Chapter 6 Truncate
Page 47 and 48: Cross polarization (a) (b) Figure 6
Page 49 and 50: esults and was centered at 5.8 GHz
Page 51 and 52: Return Loss The return loss for thi
Page 53 and 54: Axial Ratio Axial ratio gives an id
Page 55 and 56: 6.3.5 Simulated Results for Antenna
Page 57 and 58: Axial Ratio Axial ratio is another
Page 59 and 60: The results are very identical to t
Page 61 and 62: Results The simulation results of t
Page 63: 7.3 Spiral Antenna A spiral antenna
Page 67 and 68: 7.5 Conclusion All three antennas d
Page 69 and 70: 0 -‐2 -‐4 -‐6 -‐8 -
Page 71 and 72: Similarly the return loss measured
Page 73 and 74: Chapter 9 Conclusion Different Ante
Page 75 and 76: X Antenna (with 1.6 mm Substrate) A
Page 77 and 78: References [1] Per-‐Simon Kilda
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Master Thesis

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