Ultra-Compact E-Plane Waveguide Filtering Antenna Based on Meander-Loop Resonator for 5G mmWave Applications

In this paper, an ultra-compact mmW E-plane waveguide filtering antenna using a pair of metal strips and a meander ring resonator is presented, in which two transmission zeros (TZs) is located at the lower stopband and the other one TZ at the upper stopband. The proposed filtering antenna with stable radiation patterns in the passband and high-frequency selectivity characteristic is only 12 mm in the length of the E-plane substrate. The proposed filtering antenna has an endfire radiation pattern that shows superior performance including cross-polarization discrimination higher than 42dB in the main beam direction, front-to-back greater than 7.84dB and a high gain of 7.8 dBi.