Triple-Band Dual-Polarized SIW Cavity-Backed Differential Slot Antenna

A differential triple-band dual-polarized cavity-backed substrate-integrated waveguide (SIW) slot antenna is presented in this letter. The hybrid TE
₁₃₀
, TE
₃₂₀
, and TE
₁₄₀
modes of the square SIW cavity are excited by differential feed for a triple-band realization. The proposed antenna exhibits dual-polarized radiations at 9.06, 11.86, and 14.23 GHz. An isolation better than 40 dB in all the three frequency bands between the differential ports is obtained. The proposed structure exhibits the differential gain of 5.4, 10.7, and 9.5 dBi at 9.06, 11.86, and 14.23 GHz, respectively. To validate the design approach, the proposed antenna is fabricated and its characteristics are measured.