Synthetic aperture radar (SAR) is an active sensor that can produce high resolution imagery\udin microwave bands.\udA circularly polarized SAR (CP-SAR) to be launched onboard a micro-satellite is currently\uddeveloped in the Microwave Remote Sensing Laboratory (MRSL) of the Center for\udEnvironmental Remote Sensing (CEReS), Chiba University. As part of the project, an\udairborne CP-SAR development is also undertaken in order to obtain sufficient knowledge of\udCP-SAR sensor systems. An L-band CP-SAR system will be designed for operation onboard\udan unmanned aerial vehicle (UAV).The remainder of this chapter is organized as follows. Section 2 explains the methodology\udused to design and develop the CP microstrip antennas. The numerical simulation and\udmeasurement results for the single elements are presented in section 3 along with\udexplanations of the results, whereas for the array antenna is discussed in section 4. Finally,\udthe summary and conclusions of this work are presented in the section 5.
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