Design of a High-Gain Antenna System for MM-Wave Full-Duplex Communication

Advanced antenna designs are crucial for millimeter-wave (mmWave) 5&6G communication to support higher data rates, lower latency, and reduced power consumption. These demands can be partially met through wideband antenna arrays, while full-duplex radios further enhance spectral efficiency by enabling simultaneous transmission and reception in the same band. This paper proposes a patch antenna array architecture for full-duplex mmWave applications, which can significantly mitigate self-interference at the antenna stage. The array achieves broadside symmetrical radiation patterns and exhibits exceptional isolation characteristics, making it well-suited for mmWave full-duplex operation. Simulation results demonstrate a gain of circa 17.5 dB, self-interference (SI) isolation less than −55 dB reaching to −85 dB between the transmit (Tx) and receive (Rx) ports, and mutual coupling (MC) level below −10 dB reaching to −16.5 dB within the Tx and the sampling (Rs) port, across the 26-27 GHz band. Additionally, the proposed design achieves a radiation efficiency of approximately 90%.