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( 千葉大学学位申請論文 ) Development of Circularly Polarized Microstrip Antennas for CP-SAR System Installed on Unmanned Aerial Vehicle 2012 年 7 月千葉大学大学院融合科学研究科情報科学専攻知能情報コースヨハンドリ i
Abstract The discussion about development of circularly polarized microstrip antennas for circularly polarized synthetic aperture radar (CP-SAR) system will be presented in this dissertation. The antennas are designed to operate in L-band and will be installed on an Unmanned Aerial Vehicle (UAV). The single element and array configuration of the antenna are designed, numerically analyzed, fabricated and measured experimentally. The single element antenna is designed using circular microstrip shape, and the circular polarization radiation is produced with a triple-fed which the phase shift between the three feeds is adjusted about of 120 to obtain the good 3-dB axial ratio performance. In other hands, an array antenna (2 × 6 elements) is developed with the proximity feed and a circular-sector stub as a power divider is adopted in feeding network. In addition, a design of broadband circularly polarized microstrip antenna and a low side lobe level array antenna also will be presented in this dissertation. There are several considerations in developing the antenna, the specification of the CP-SAR system, payload of the UAV and the space for the antenna onboard UAV. In general, numerical analyses of the proposed antennas using the method of moments can lead to a good agreement with experimental results. The slight differences of antenna performance between the simulation and measurement are probably due to imperfection during the fabrication processes. These antennas with its good performance will be useful for several L-band applications, especially for circularly polarized synthetic aperture radar system. Based on the whole research works, new analysis has been made on the characteristics of proposed antennas with new feed method both single element and array configuration of the antenna. ii
Page 1: Development of Circularly Polarized
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 and 34: CP-SAR geometry, the slant range ,
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
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3.4.1 Linear array Among the differ
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provide additional variables which
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The beam area or solid angle or Ω
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2005). An array of even number of i
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BIBLIOGRAPHY m = 8 cos(mu) = 128z 8
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BIBLIOGRAPHY [21] Rahmani M., Tavak
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Figure 4.1: Design methodology. 56
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Figure 4.2: Flow chart of the anten
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Figure 4.3: Diagram of required ant
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easy if you have the right equipmen
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Chapter 5 Results and Discussion 5.
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Figure 5.2: Geometry design of prop
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terminals during the radiation proc
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5.1.4 Radiation characteristic The
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Figure 5.11: Measured and simulated
Page 87 and 88:
the physical length, L, and the eff
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Figure 5.13: Photograph of the fabr
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Figure 5.15: Simulated and measured
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In Figure 5.18, the antenna gain wi
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Figure 5.20: Array antenna characte
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Figure 3 shows the design and photo
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Figure 5.24: Simulated and measured
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5.4 Broadband circularly polarized
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Figure 5.29: Axial ratio (AR) plott
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Figure 5.33: A 3D beam pattern of t
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Figure 5.34: Dolph-Chebyshev array
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measurement, respectively. Such deg
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Figure 5.40: Relationship between a
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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
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List of Publications Peer-reviewed
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Curriculum Vitae YOHANDRI He was bo
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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
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Figure B.8: Three-dimensional far-f
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Figure C.1: (a) Seven Mini PCB Prot
Page 135 and 136:
Figure C.3: Etching tank and chemic
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