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

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The resolution of the CP-SAR in azimuth direction δ ACP can be determined as δ ACP = Rλ 2L SACP (2.30) Where, the length of synthetic aperture of the CP-SAR L SACP = Rθ ACP , therefore δ ACP = λ 2θ ACP (2.31) As we can see, the azimuth resolution of the CP-SAR sensor is not depend on the physical length of the antenna. In other hand, the ground resolution δ rgCP as function of chirp pulse bandwidth (B), light velocity (c) and incidence angle (θ i ) can be formulated as δ rgCP = c 2B sin θ i (2.32) Where the incidence angle θ i can be calculated ( ) θ i = sin −1 R e + H sin θ o R e (2.33) For the airborne system, the high of the platform, H is relative small compare to the earth radius (R e ≈ 6371 km), (H
Figure 2.12: The required (a) θ ECP and (b) θ ACP for 1 m image resolution. In our project, the CP-SAR sensor resolution is targeted around 1 m. The resolution of the SAR images can be determined from the swath width W g as δ rgCP = W g 1000 (2.35) δ ACP = δ rgCP (2.36) Based on equation (2.35), the desired W g should be around 1 km. The θ ECP can be obtained using equation (2.23) and (2.28). Since, the θ ACP is also set to 1 m (equation (2.36)), then the required θ ACP can also be estimated using equation (2.31). Figure 2.12 (Rizki Akbar et al., 2010) illustrate the required θ ECP and θ ACP for θ o ranging from 40 o up to 60 o . By substituting the antenna size (1.5m × 0.4 m) to equation (2.22), the maximum value of θ ECP and θ ACP equal to 29.78 o and 7.10 o . As shown in Figure 2.12, the smaller θ ECP is obtained at higher altitude, while the θ ACP almost constant (see Figure 2.12b). Due to the half power beam width limitation in equation (2.22), for θ o equals to 40 o and 41 o , the maximum W g that could be obtained are around 0.95 and 0.99 km. Therefore, the targeted resolution becomes 0.95 and 22
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 and 32: Figure 2.9: Basic principle of aper
Page 33: CP-SAR geometry, the slant range ,
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
Page 99 and 100:
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
Page 115 and 116:
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
Page 125 and 126:
are integrated into MGRID. PATTERN
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properly. After a rectangle is draw
Page 129 and 130:
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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