Millimeter-Wave Wideband, High-Gain, Dual-Polarized Filtering Patch Antenna With <i>Y</i>-Shaped Probe and Shorted <i>C</i>-Shaped Strip

This communication presents a wideband high-gain dual-polarized filtering patch antenna working in the millimeter-wave band. A Y-shaped feeding probe is proposed to excite the square patches. This novel feeding scheme provides a high-pass filtering response with a wide bandwidth. Four center-shorted C-shaped strips are loaded to increase the lower stopband’s suppression level and the passband’s radiation gain. While the suppression in the higher stopband is attributed to a stepped impedance substrate-integrated waveguide (SIW) feeding structure. Subsequently, a partially reflecting surface structure is designed for gain enhancement, forming a dual-polarized Fabry-Pérot Cavity (FPC) filtering antenna. When the two ports are respectively excited, the −10 dB impedance bandwidths are 21.9% and 18.5%, the measured peak gains reach 15.9 and 15.5 dBi, and the 3 dB gain bandwidths are 17.2% and 18.3%. Excellent rejection levels of better than 24 dB are achieved in the stopbands for both polarization states.