A composite antenna with high-gain at dual-band

Abstract

A composite high gain antenna whose working frequencies are separated far away from each other is proposed in this paper. It is composed of a dielectric superstrate that is excited by patch antennas. The superstrate works as electromagnetic band gap (EBG) resonator for C band achieving the gain of 16.7 dBi at 4.8 GHz in simulation. While it also works as Fresnel lens for K band, the gain reaches 30.4 dBi at 24 GHz. Compared to a single patch antenna, 7.2 dB and 21.4 dB gain enhancement are obtained in those two frequencies respectively. The impact of the superstrate is also verified by the experiment. It has been confirmed that the superstrate increases gain at two frequency bands.