volume | PIER Journals

Abstract

This paper specifies optimization of a low active reflection coefficient (ARC) array element with a cavity-backed microstrip patch (CBMP) using a genetic algorithm (GA) at wide-band and 2-dimensional (2D) wide angle. Both the GA implemented with a user-defined MATLAB code and a 3-dimensional (3D) full-wave electromagnetic simulator CST MWS are simulated with a real-time direct link. An optimization method using not a traditional unit cell ora small array but a 15 × 15 finite array structure is proposed to apply to a large-scale array antenna. The CBMP array antenna to meet a design goal of a max ARC is optimally designed at equally divided 9 frequencies and 11374 beam angles for S-band 400 MHz operating frequency bandwidth and beam scan coverage (Az = -60° ~ +60°, El = -3° ~ +90°). Measurement results show that a prototype and a full-scale array antenna have low ARC below -8.1 dB and -6.9 dB respectively for required wide frequency bandwidth and beam scan coverage. It is confirmed that the proposed method is a good solution for optimizing a large-scale array antenna.

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Dr. Doo-Soo Kim

Dr. Il-Tak Han

Dr. Woo-Sung Kim

Dr. Jin-Mo Yang

Dr. Yong-Hee Han

Dr. Kyung-Tae Kim