Indoor ISAC Demonstrator with Aperture Coupled Antennas (ACA) at Wi-Fi Band for 6G Applications

In this paper, co-located single-element aperture coupled antennas (ACA) working at the Wi-Fi frequency band are presented. The antenna shows an operating bandwidth of 320 MHz at 6.11 GHz center frequency and exhibits an isolation of 38 dB over the desired frequency band. The mutual coupling reduction is achieved by utilizing complementary split ring resonators (CSRR) in the ground plane and the integrated antennas show a smooth measured gain of 8 dBi in the entire working frequency band. Moreover, the co-located antennas are further integrated with the software-defined radio (SDR) to demonstrate its indoor sensing capabilities up to a distance of two meters. Simultaneously, the communication performance is shown and evaluated by employing a separated horn antenna receiver in a demonstrator designed for integrated sensing and communication (ISAC) applications.