Dual-Polarized High-Isolation Textile SIW Antenna at 5 GHz Full-Duplex Communication in Body-Area Networks

Abstract

A compact co-frequency dual-polarized substrate-integrated-waveguide (SIW) cavity-backed slot antenna for 5-GHz wearable in-band full-duplex (IBFD) communication is described. The antenna is fabricated on a 1.5-mm felt textile substrate and is excited by two quadrature-fed annular slots in a 46.8-mm circular SIW cavity to excite orthogonal co-frequency waves. The full-wave simulation results reveal a resonance of 5.538 GHz, an impedance bandwidth of 168 MHz, a peak realised gain of 5.90 dBi and a port-to-port isolation of 47.78 dB at the resonance. The cylindrical-bending and body-phantom modelling results show that the wearable performance is stable with the on-body directivity of 7.55 dBi and radiation efficiency of 55.1%. Hence, the suggested textile antenna is a good contender for small IBFD links for body-centric systems.