High-Gain SIW Antenna with Ridge Gap Waveguide Feed for W-Band Applications

A high-gain substrate integrated waveguide (SIW) for W-band applications is designed and analyzed in this paper. The proposed antenna utilizes a well-established approach by combining SIW technology with a microstrip-based ridge gap waveguide (GWG) feed for better gain and efficiency. The integration of a novel slot on the radiating aperture, along with the ridge-based GWG feed, minimizes losses and yields efficient transmission. The proposed antenna has a boresight gain of more than 9.5 dB and an impedance bandwidth of 85-95 GHz. The combination of SIW and ridge-based GWG results in a compact, multi-layered structure that offers wider bandwidth, minimized losses, and enhanced gain. The radiation performance of the proposed antenna is authenticated through simulations using CST EM simulation software, showing over 90% radiation efficiency. For actual operating scenarios, a wideband transition structure between rectangular waveguide (RWG) and GWG is also designed. The proposed antenna design holds potential for applications requiring high-gain, wideband, and efficient radiation in W-band or millimeter wave (mmWave) communication systems.