Broadband full-duplex antenna for IEEE 802.11 protocols

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Official URL: https://dx.doi.org/10.1109/LAWP.2021.3101423

In this letter, a broadband two-port full-duplex (FD) antenna is designed, implemented, and measured. The broadband two-port FD antenna is based on a three-port radiating disk integrated with a broadband balun for differential feeding. The prototype antenna provides more than 30 dB interport isolation for 10 dB return loss bandwidth of 4.9 GHz (2.3-7.2 GHz), moreover, higher than 40 dB interport isolation is achieved for 1.2 GHz bandwidth (3.6-4.8 GHz). The measured peak realized gain achieved is between 2.92-8.26 dBi. To the best of our knowledge, no such a planar antenna in existing literature achieves more than 30 dB interport isolation for such a wide bandwidth. The broadband two-port FD antenna can be used for sub-6 GHz 5G (NR) applications and all Wi-Fi bands including the IEEE 802.11be which requires full-duplexity, wide bandwidth, and backward compatibility.