Differentially SIW TE20-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.