Differentially SIW TE 20 -Mode Fed Substrate Integrated Filtering Dielectric Resonator Antenna for 5G Millimeter Wave Application

A differential substrate integrated filtering dielectric resonator antenna (DRA) fed by TE 20 -mode in substrate integrated waveguide (SIW) for 5G millimeter wave (mm-Wave) systems is proposed. The dielectric resonator (DR) acts as a radiator as well as the last resonator of a bandpass filter simultaneously to realize a filtering antenna. The DR operates at the typical differential TE 111 mode and is excited by TE 20 mode of SIW. The differential feeding scheme provides the antenna with an improvement on radiation pattern symmetry and low cross-polarization level. Besides, this antenna can be manufactured using standard printed circuit board (PCB) technology which minimizes assembly errors. For demonstration, a prototype based on the proposed design theory is designed and obtains an impedance bandwidth of 10.3% from 24.7 GHz to 27.4 GHz, an average gain of 6.7 dBi and a cross-polarization level lower than -35 dB in E-plane and -20 dB in H-plan.