Design of Microstrip Reflectarray Antenna Using a Genetic Algorithm Based Optimization Method

Abstract The design of the microstrip reflectarray antenna is commonly based on the reflection phase curve, but this is not an accurate method, as many parameters have been neglected in the design procedure. This work explores the genetic algorithm in conjunction with full-wave simulation and the cluster parallel computation to design a microstrip reflectarray antenna. A microstrip reflectarray antenna, which consists of a 7 × 7 rectangular-patch/ring-combination reflection elements and is illuminated by a patch antenna, is designed for high gain. Results demonstrate that in comparison with the design method based on the reflection phase curve, the proposed optimization method is able to design a microstrip reflectarray antenna with better performances; e.g., the gain has been considerably improved (from 18.1 dBi to 19.5 dBi) at the design frequency of 5.8 GHz.

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