Integrated Multi-Port SIW Antenna with Self-Quadruplexing Capability and Circular Polarization Features for 6G Communication System

Abstract A thin, small substrate integrated waveguide (SIW)-based antenna intended for quad-band operation is presented in this study. The design is straightforward and simple to use. The top surface of the SIW cavity is divided into four various radiating patches fed with a printed line. The antenna achieves peak gains of 5.12 dBi, 6.0 dBi, 5.8 dBi, and 5.55 dBi while operating 5.3 GHz, 5.7 GHz, 6.8 GHz, and 7.6 GHz. The antenna maintains isolation over 30 dB. Because of its design, each resonant frequency may be changed with a single parameter without influencing other aspects of performance. Additionally, circular polarization feature has been added to all four-operating band by loading stair shaped slot with each radiator. To confirm the findings, a prototype is built on FR-4 substrate and put through experimental testing. The antenna is ideal for 6G Communication system.