A High-gain Broadband Filtering Antenna Based On ISGW

This study presents a high-gain millimeter-wave integrated substrate gap waveguide (ISGW) filtering antenna. The design features a primary rectangular radiating patch that is flanked by coplanar parasitic rectangular patches. An H-shaped coupling slot is integrated into the primary radiator to enhance performance. This strategic arrangement creates three resonant modes within the operational bandwidth, which leads to an extended impedance bandwidth. Additionally, four U-shaped slots are incorporated into the middle layer of the ISGW as part of a Defected Ground Structure (DGS).