A high-gain resonant cavity antenna with orthogonal polarizations working at 28 GHz

Abstract

In this paper, a high-gain resonant cavity antenna (RCA) with orthogonal polarizations working at 28 GHz is presented. This antenna is composed of a patch-type frequency selective surface (FSS) as RCA superstrate and a dual-feed dual-polarized microstrip patch antenna as the feeding system. The FSS is located at a designated height above the ground plane of the microstrip patch antenna. By adjusting the size of the FSS unit and the height of resonator, the electromagnetic waves can reflect inside the cavity continuously, thus the gain can be enhanced when the partial rays projected though the space have equal phases in the normal direction. According to the simulation, the proposed design has both vertical polarization (V-pol) and horizontal polarization (H-pol) at 28 GHz with low cross polarization, better than −27 dB. The gains in two polarizations can reach 16 dB at 27.5 GHz over the impedance bandwidth of 1.8 GHz (27.2–29 GHz).