A dual-band dual-polarized shared-aperture SIW slot antenna array with beam scanning

This letter proposes a low-profile dual-band dual-polarized (DBDP) substrate-integrated waveguide (SIW) slot antenna array with beam scanning. By stacking the SIW transverse slot array (TSA) above the longitudinal slot array (LSA) in one aperture, two orthogonal polarizations are generated at two bands. To avoid the radiation slots of the LSA and the TSA from overlapping, the LSA is developed based on the proposed LSA unit whose collinear-slot arrangement is realized by introducing metallized vias. Two planar parabolic reflectors based linear source generators (LSGs) are integrated to feed the shared-aperture radiation array. By moving two independent SIW horns, the proposed antenna can obtain the steering angles of +/- 34 degrees and +/- 27 degrees at the central frequencies of 11.2 and 13 GHz, respectively. Two beams with orthogonal polarizations scan in the same plane. The simulated results have been validated by the experimental ones. The proposed antenna has low profile and is a potential candidate for satellite and wireless communications.