In-band Full-duplex Bistatic Antenna with reduced Mutual Coupling

This paper describes a compact in-band full-duplex (IBFD) 2.4 GHz antenna with high isolation. One of the antennas is a conventional inset-fed microstrip antenna. The second antenna is a quarter-wavelength inset-fed microstrip antenna. The quarter-wave patch is achieved by placing cylindrical metal vias along one of its radiating edge. The two antennas are orthogonally placed with an inter-element spacing of 0.0032λ
0
making the proposed IBFD antenna structure compact than most reported structures. Inter-port isolation of 36 dB is achieved and the cross-polar components are 10 dB lower than the co-polar ones. A comparison of measured and simulated results serves to validate the proposed design concept.