Wideband dual‐polarized antenna with high isolation for full‐duplex application

Abstract

A wideband dual-polarized antenna with high isolation is proposed for full-duplex applications. It consists of a radiating patch, two E-shaped strips, a parasitic patch, a metal reflector, and a 180°power divider. Two hook-shaped strips and a pair of E-shaped strips are used to excite the radiating patch realize ±45°polarization. The impedance matching is significantly enhanced by the attendance of the parasitic patch and 180°power divider. Multiple decoupling techniques, including polarization diversity, radiation mechanism diversity, shunt effect of a shorting pin, and differential feeding, are simultaneously used to achieve high isolation. An antenna prototype is measured with an impedance bandwidth of 52.2% (1.7-2.9 GHz) for |S 11 |, |S 22 | < −10 dB, and high isolation of better than 55 dB. These characteristics make it a promising candidate for in-band full-duplex wireless communication systems.

A Simultaneously Transmit and Receive Antenna Terminal for In-Band Full-Duplex Applications

“…In this scheme, a reflective terminal is used to cancel the direct coupling between the transmit and receive antenna. Whereas by employing differential feeding schemes and/or 180 °hybrid couplers for patch antenna, interport isolation ranging from 40 to 90 dB can be achieved [4][5][6][7][8]. However, it can be observed that high levels of isolation are achieved at the cost of bandwidth.…”