Development of Circularly Polarized Microstrip ... - CEReS - åèå¤§å¦

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tion. The definition and limitation of the 3-dB axial ratio is gived in Figure 2.10 (Rizki Akbar et al., 2010). Figure 2.10: Description of 3-dB axial ratio beamwidth for CP-SAR. 2.5 Design of CP-SAR onboard UAV As already mentioned earlier, in order to design CP-SAR sensor onboard UAV and obtain high quality and efficiency in these applications, the CP-SAR parameters, size and weight should be thoroughly considered. In this section, the design of CP-SAR parameters and CP-SAR system will be presented. 2.5.1 Design of CP-SAR parameters The parameters CP-SAR onboard UAV can be derived based on the geometry system both in slant range and azimuth view as illustrated in Figure 2.11. In this figure, the essential parameters of the CP-SAR are the airborne altitude, H, off nadir angle θ o , incidence angle θ i , and the desired swath width and the maximum swath width W g and W gmax , respectively. Parameter R m is the CP-SAR middle slant range, R a (R n ) is CP-SAR near slant range, R b (R f ) is CP-SAR far slant range for the desired swath width (maximum swath width). Based on the 19
CP-SAR geometry, the slant range , R n is determined by the value of θ ECP as following R n = H cos (θ o − (θ ECP /2)) (2.25) R m = H cos θ o (2.26) R f = H cos (θ o + (θ ECP /2)) (2.27) Based on the figure 2.11a, the maximum swath width can be calculated as Figure 2.11: CP-SAR geometry: (a) slant range view and (b) azimuth plane view. W g = √ R 2 f − H2 − √ R 2 n − H 2 (2.28) Substitute equation (2.27) to (2.28) W g = √ ( ) √ 2 ( ) 2 1 1 − 1 − − 1 − W g cos (θ o + (θ ECP )/2) cos (θ o − (θ ECP )/2) H = 0 (2.29) 20
Page 1 and 2: Development of Circularly Polarized
Page 3 and 4: Abstract The discussion about devel
Page 5 and 6: Acknowledgements First and foremost
Page 7 and 8: CONTENTS 3 Circularly Polarized Mic
Page 9 and 10: List of Figures 1.1 Electric field
Page 11 and 12: LIST OF FIGURES 5.13 Photograph of
Page 13 and 14: List of Tables 2.1 Parameters of CP
Page 15 and 16: in linear polarization has some fla
Page 17 and 18: polarization (RHCP) and left-handed
Page 19 and 20: BIBLIOGRAPHY Bibliography [1] Birk
Page 21 and 22: Chapter 2 Circularly Polarized Synt
Page 23 and 24: generates all the necessary timing
Page 25 and 26: line platform flight trajectory is
Page 27 and 28: Figure 2.6: Range ambiguities: Port
Page 29 and 30: Substituting (2.12) and (2.13) into
Page 31: Figure 2.9: Basic principle of aper
Page 35 and 36: Figure 2.12: The required (a) θ EC
Page 37 and 38: 2.5.2 Design of CP-SAR system 2.5.2
Page 39 and 40: BIBLIOGRAPHY Figure 2.15: Design of
Page 41 and 42: BIBLIOGRAPHY [14] Steven Z., Unmann
Page 43 and 44: developments of novel microstrip an
Page 45 and 46: to feed or excite a microstrip patc
Page 47 and 48: defines as the ratio of the power g
Page 49 and 50: 3.2.6 Radiation pattern In the fiel
Page 51 and 52: Figure 3.6: Rectangular patch arran
Page 53 and 54: diagonals axis. The area of the per
Page 55 and 56: By substitute eq. (3.7-3.9) to (3.1
Page 57 and 58: 3.4.1 Linear array Among the differ
Page 59 and 60: provide additional variables which
Page 61 and 62: The beam area or solid angle or Ω
Page 63 and 64: 2005). An array of even number of i
Page 65 and 66: BIBLIOGRAPHY m = 8 cos(mu) = 128z 8
Page 67 and 68: BIBLIOGRAPHY [21] Rahmani M., Tavak
Page 69 and 70: Figure 4.1: Design methodology. 56
Page 71 and 72: Figure 4.2: Flow chart of the anten
Page 73 and 74: Figure 4.3: Diagram of required ant
Page 75 and 76: easy if you have the right equipmen
Page 77 and 78: Chapter 5 Results and Discussion 5.
Page 79 and 80: Figure 5.2: Geometry design of prop
Page 81 and 82: terminals during the radiation proc
Page 83 and 84:
5.1.4 Radiation characteristic The
Page 85 and 86:
Figure 5.11: Measured and simulated
Page 87 and 88:
the physical length, L, and the eff
Page 89 and 90:
Figure 5.13: Photograph of the fabr
Page 91 and 92:
Figure 5.15: Simulated and measured
Page 93 and 94:
In Figure 5.18, the antenna gain wi
Page 95 and 96:
Figure 5.20: Array antenna characte
Page 97 and 98:
Figure 3 shows the design and photo
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Figure 5.24: Simulated and measured
Page 101 and 102:
5.4 Broadband circularly polarized
Page 103 and 104:
Figure 5.29: Axial ratio (AR) plott
Page 105 and 106:
Figure 5.33: A 3D beam pattern of t
Page 107 and 108:
Figure 5.34: Dolph-Chebyshev array
Page 109 and 110:
measurement, respectively. Such deg
Page 111 and 112:
Figure 5.40: Relationship between a
Page 113 and 114:
Figure 5.42: Array antenna characte
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BIBLIOGRAPHY single-feed circular m
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antenna for CP-SAR sensor. In the c
Page 119 and 120:
List of Publications Peer-reviewed
Page 121 and 122:
Curriculum Vitae YOHANDRI He was bo
Page 123 and 124:
To perform an electromagnetic simul
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are integrated into MGRID. PATTERN
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properly. After a rectangle is draw
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Figure B.5: Frequency sweep in simu
Page 131 and 132:
Figure B.8: Three-dimensional far-f
Page 133 and 134:
Figure C.1: (a) Seven Mini PCB Prot
Page 135 and 136:
Figure C.3: Etching tank and chemic
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