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, TE
₂₁₀
and TE
₁₂₀
. 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.