Design of wideband circularly polarized stacked microstrip antennas with dielectric cover using single coaxial feed

A theoretical design of single coaxial-feed wideband circular polarized rectangular stacked microstrip antennas (CPSMAs) with dielectric cover is present by using optimization of feed location and other parameters. The location of the single coaxial feed, foam thickness between driven and parasitic patches and aspect-ratio of parasitic patch is optimized for wideband and quality of circular polarization (CP). Prototype antenna designed, fabricated, and measured its performance. The antenna has measured 3-dB AR bandwidth of 13.5%, minimum AR of 0.5 dB, a 10-dB return loss bandwidth of 21.5%. The gain of antenna is more than 7.5 dBic over the 3-dB AR bandwidth and peak gain about 9 dBic at 5.6 GHz. The total antenna height is 8.583 mm or 0.157 λ₀ at 5.5 GHz, where λ₀ is the free space wavelength. The proposed techniques simplify the design of wideband circularly polarized antennas with cover for medium to high gain applications.