High gain wideband 60 GHz antenna based on patch structure with SIW feed and CSRR loading for quasi optical millimeter wave applications

This paper presents a compact, high-gain, and wideband patch antenna designed for operation within the 60 GHz millimeter-wave band, where electromagnetic waves exhibit quasi-optical behavior. The antenna employs a Substrate Integrated Waveguide (SIW) feeding structure combined with a cavity-backed configuration to enhance gain and radiation directivity characteristics. A segmented circular patch loaded with a Complementary Split-Ring Resonator (CSRR) is employed to improve impedance matching and significantly broaden the bandwidth. The CSRR element is strategically integrated to refine the antenna’s frequency response, while the SIW feed ensures low-loss signal transmission. The cavity-backed design further boosts antenna efficiency and gain. The optimized antenna achieves a 16.6 GHz bandwidth, covering the entire unlicensed 60 GHz spectrum, and delivers a peak gain of 14.19 dB. Its compact form, broad bandwidth, and strong efficiency make it well-suited for advanced short-range millimeter-wave links, effectively bridging microwave and quasi-optical design concepts. A compact, high-gain antenna developed for 60 GHz millimeter-wave applications. Innovative SIW and CSRR design achieves broad bandwidth and strong efficiency. Enables reliable, high-speed links for next-generation short-range communications.