Abstract
A single short backfire antenna has an enclosed structure with no sharp projections and approximately 15 dBi gains, making it attractive for handheld radio monitoring and other man-portable applications. However, a microstrip patch fed short backfire antenna had a broad E -plane radiation pattern main lobe, leading to a loss of gain and low aperture efficiency. The antenna was studied using a commercially available method of moment's software. Adding eight parasitic wires inside the cavity of a short backfire was found to narrow the E -plane radiation pattern main lobe, making it more like the H -plane radiation pattern and increasing the peak gain by 1.5 dB. A single proof of concept antenna was built at 1.49 GHz, which had a bandwidth of 2.3%, aperture efficiency of 78% and was shown to have equalized principal plane main lobes.
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