Dual-Band Dual-Polarization Cavity-Backed Slot Filtering Antenna With Double Radiation Directions

A new dual-band dual-polarization cavity filtering antenna is proposed, which consists of a dual-band bandpass cavity filter and a dual-polarization cavity-backed slot antenna. The fractional bandwidth of the passband 1 is 0.96%(8.438 GHz -8.52 GHz), the fractional bandwidth of the passband 2 is 0.55% (8.7 GHz-8.75 GHz), and there are three radiation nulls. The simulation result shows that the proposed filtering antenna has good out-of-band rejection performance, and the radiation pattern has very good coherence, bi-directional radiation characteristics in both frequency bands.