volume | PIER Journals

Abstract

In this paper, a design method that employs simulated annealing (SA) algorithm to create stub structure of a dual-layer microstrip patch antenna for circular polarization is presented. Firstly, based on established controls of SA algorithm, a series of stub structures have been created automatically on the stacked parasitic element - (Split Ring Resonator) SRR of antenna. The desired stub structure is chosen according to the generation of orthogonal modes that produce circular polarization through the electromagnetic coupling to the driven patch with an SRR-shaped slot. Then, a dual-layer microstrip patch antenna with a Z-shaped stub and left-hand circularly polarized (LHCP) characteristic is obtained by employing the assisted design. The designed antenna is simulated, optimized, fabricated, and measured. The results show that the microstrip patch antenna with Z-shaped stub has a simulated minimum axial ratio of 1.64 dB at 2.4 GHz, and the measured peak gain can be up to 5.87 dBi.

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Dr. Li Guo

Dr. Zhiqiang Yao