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Subject Area

Civil and Environmental Engineering

Article Type

Original Study

Abstract

A synthetic aperture radar (SAR) sensor antenna is the main concern in this research work. The antenna specifications are settled according to the link budget of a project funded by the Egyptian Space Agency. The antenna should achieve a 30 dBi gain and an SLL of less than -27 dB with a low-profile and simple structure. The proposed antenna is an array of 16 x 18 planar elements that based on microstrip technology. The 16 x 18 antenna array consists of 16 linear antenna arrays of 18 elements each. Each element of the antenna array has two orthogonal slots with dual-polarization capability. To overcome the disadvantages of high loss on an extended feeding network, the column array is designed using a series feed technique. Also, to keep the design simple, a corporate feed is used to form the planar array. Synthesized excitations are used to enhance the SLL to -27.2 dB. Also, a novel feeding network is designed to easily produce the required field distributions. The proposed antenna has a broad bandwidth (5.2–5.4 GHz). Furthermore, the proposed design achieves good broadside dual linear polarization. The proposed antenna has a high gain, a smaller beamwidth, a compact size, a good SLL, and a wide bandwidth, all of which are important parameters in SAR antennas.

Keywords

Synthesized Radiation pattern, Unequal Excitations, MoM/GA, Antenna array, Series feed, Slot antenna, Synthetic Aperture Radar, SAR antenna

Creative Commons License

Creative Commons Attribution 4.0 License
This work is licensed under a Creative Commons Attribution 4.0 License.

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