Bistatic U-Slot Microstrip Patch Antenna for Dual-Band In-Band Full-Duplex

This paper implements an in-band full-duplex (IBFD) bistatic microstrip patch antenna with a U-slot for dual-band wireless communication. Two inset feed U-slot microstrip patch antennas, for transmitter (Tx) and receiver (Rx), are placed orthogonally, separated by a small distance, and a set of shorting vias are inserted along the Rx antenna's radiating edge in-between the antennas. In this compact layout, top-to-bottom connected vias are used to make the antenna a short-circuited quarter-wave resonator and minimize the mutual coupling between the antennas. Tx and Rx antennas have an isolation of −44 dB and −24 dB at 2.12 GHz and 5.28 GHz, respectively. Tx antenna has radiation directivity of 5.19 dBi and 6.33 dBi at 2.12 GHz and 5.28 GHz, respectively. The gain of the Rx antenna in the direction of maximum radiation is 4.91 dBi and 4.42 dBi at 2.12 GHz and 5.28 GHz, respectively.