Regular circular and compact semicircular patch antennas with a T‐probe feeding

Wideband T‐probe proximity‐fed regular circular and compact semicircular patch antennas are proposed in this paper. For the regular circular patch antenna, using a foam layer of thickness ∼0.13λ 0 as a supported substrate, an impedance bandwidth of 35% and a gain of over 8.0 dBi have been obtained. For the compact semicircular patch antenna, an impedance bandwidth of 56% and a gain of over 5.4 dBi are achieved with the same substrate thickness. The far‐field patterns are stable across the passband. Experimental and computed results based on the finite‐difference time‐domain method are provided.