A Study on Microstrip-fed Shorted Patch Antennas

This paper studies the performance of microstrip-fed shorted patch antenna (SPA) by three different feeding schemes with a comparison of the traditional probe-fed one. It will be shown that the microstrip-fed SPAs generally exhibit similar gain and radiation pattern compared to the probe-fed SPA. The SPA fed from side edge behaves a larger cross-polarization radiation in E plane while the one fed from open or shorted edge remains the similar cross-polarization level as the probe-fed one. Besides, it was found that the SPA fed from shorted edge behaves a reduced resonant frequency while the one fed from open edge is opposite and performs smallest gain as well as bandwidth compared to other schemes.