Dual polarized patch antenna array with improved isolation and gain for full-duplex wireless communications

This work presents a dual polarized microstrip patch antenna array with improved isolation and gain for in-band full-duplex wireless communications. The proposed system comprises two four-element planar arrays located on the same substrate to provide orthogonal polarizations at 12 GHz. The corporate feeding technique is used to feed the first array, while the second array is fed using the series-fed method. The simulated − 10 dB bandwidths of transmit and receive operations are 1200 MHz and 870 MHz, respectively. In addition, the design maintains a simulated isolation, S21, around − 40 dB between transmit and receive ports during the operating band. The measured results are in good agreement with simulations achieving high isolation bandwidth, reaching as low as − 58 dB at the center frequency. The antenna array provides measured gain from 6 dB to 6.8 dB and low cross-polarization fields through the entire band of interest. The proposed system is also suitable for small form factor devices due to its compact structure.