Planar Sub-THz Shared-Aperture Dual-Band 4×2 Slot Array Antenna Using Gap Waveguide

The paper presents the design and implementation of a dual-band antenna array operating in the D-band, utilizing gap waveguide (GW) technology. The proposed antenna features a compact and efficient single layer feeding network, capable of functioning at both 112 GHz and 132 GHz. The feeding network integrates hybrid configurations of Groove gap waveguide (GGW) and Ridge gap waveguide (RGW) to achieve optimal power distribution and impedance matching across two frequency bands. The 4×2 slot array antenna demonstrates a peak gain of 16 dBi at 112 GHz and 15.3 dBi at 132 GHz, with total radiation efficiency exceeding 80% in both bands. Fabrication results validate the antenna's performance, highlighting its suitability for highfrequency communication system requiring dual-band operation with higher gain and efficiency.