A High-Gain Wideband Low-Profile Fabry–Perot Resonator Antenna With a Conical Short Horn

A compact wideband high-gain antenna is proposed and developed by using various performance enhancement structures. First, a Fabry-Perot resonator antenna (FPRA) is investigated with a single truncated superstrate that achieves increased reflection phase, low profile, compact size, and wide bandwidth. A conical horn is then incorporated with the FPRA to enhance its gain without compromising other performances such as input impedance matching and gain bandwidth. Both simulations and experiments were carried out to validate the designs, and good agreements are obtained. A final antenna with a peak gain of 19.1 dBi and a 3-dB gain bandwidth of more than 26% is developed.