Dual-Band Dual-Polarized SIW Filtering Antenna

This paper presents a dual-band dual-polarized filtering antenna in SIW technology. An annular ring slot is etched on top of a SIW cavity for radiation. A vertical corner pin is introduced inside the cavity to control coupling between the first two higher order modes, TE210 and TE120. The coupling controls the radiation frequencies. The antenna provides orthogonal linear polarization at the two frequencies. A prototype filtering antenna is fabricated for radiation at 10.47 GHz and 11.87 GHz with 10 dB input matching bandwidth of 1%. Measured peak gain is at least 6.8 dBi for both the pass bands with 0.1 dB variation over the entire passband.