Aperture-shared Multi-port Waveguide Antenna with Rectangular Dielectric Resonator for 5G Applications

Abstract

An aperture-shared multi-port waveguide antenna with multiple feeds is presented in this paper. The antenna consists of sequentially rotated four traditional WR-28 waveguides at 28 GHz so as to create a multi-polarized function with decoupling between the ports. In addition, a rectangular DR (Dielectric resonator) is mounted at the center of the four apertures to obtain lower mutual coupling over a wide band and to suppress the cross-polarization in the antenna boresight direction. The proposed antenna achieves high gain of 14.4 dBi, low mutual coupling of ≤ -20 dB on average, sufficient cross-polarization discrimination level at ≃ 20 dB in the 27-29 GHz frequency band.