A Dual-Port Antenna for Colinearly Polarized Full Duplex and Pattern Reconfigurable Applications

This article introduces a symmetrical dual-port antenna designed to operate under distinct excitation strategies for two specific purposes. First, it enables co-polarized in-band monostatic full-duplex communication by independently operating the transmitter (TX) and receiver (RX) channels. Second, it exhibits radiation pattern reconfigurability when the two ports collaborate with different phase differences. Regarding the decoupling mechanism, the mutual coupling is suppressed based on the odd and even modes, by incorporating an LC resonator. It not only achieves antenna decoupling but also enables pattern reconfigurability. The antenna can realize main beam scanning between the broadside (odd mode) and end-fire (even mode) directions, maintaining stable active reflection coefficients and cross-polarization levels. Simulation results demonstrate that the port isolation exceeds 39 dB. Radiation characteristics exhibit good similarity in the operating band and radiation patterns. Favorable radiation reconfigurable performance with the broadside gain exceeding 8 dBi is achieved. The proposed versatile antenna serves as a good candidate for multi-scenario applications and array setups.