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Cross-Polarization Suppressed Microstrip Antenna With Reduced Size

A simple method for reducing the cross-polarized radiation and antenna size of a microstrip patch antenna is proposed in this paper. By using symmetric shorted parasitic elements, the proposed patch antenna achieves 17-dB enhancement in H-plane cross-polarization level (XPL) suppression. In addition, it was found that the shorted parasitic elements also significantly pull down the resonant frequency, indicating a size reduction for the proposed antenna. Simulated results demonstrate 57.8% reduction in antenna size compared with the conventional microstrip antenna.