Experimental Demonstration of SIC in a Co-linearly Polarised Full-Duplex Antenna for 6G and its Multi-Element Implementation

In this paper, we showcase an affordable in-house experimental setup to demonstrate the antenna domain self-interference-cancellation in a co-linearly polarized full-duplex antenna with 1-Tx and 1-Rx configuration. The experimental setup uses off-the-shelf devices such as MATLAB Simulink-operated software-defined radio and spectrum analyser with the developed FD antenna. Experiments are conducted for different propagation environments such as indoor and anechoic chamber to validate the design effectiveness of the developed FD antenna. Further, the FD antenna design is extended to a multi-element configuration having 1-Tx and $2-\mathrm{Rx}$ configurations. $\left|S_{i j}\right|$ of less than −30 dB and −70 dB are achieved between $2-\mathrm{Rx}$ antennas and between Tx-Rx for a three-element FD configuration respectively. Further, it is validated using fabrication and measurements.