Highly-Integrated Dual-Polarized Multibeam MMWave Array Antenna With Ultra-High Tx-Rx Isolation for In-Band Full Duplex (IBFD) Application

This article analyzes the current development status and requirements of wireless communication technology, and proposes a multibeam MM-wave antenna array with high-isolation for in-band full duplex (IBFD) wireless integrated access and backhaul application based on this analysis. A bistatic simultaneous transmitting and receiving antenna architecture, a low loss multibeam antenna array architecture based on Rotman lenses, and an antenna packaging design based on multi-layer PCB technology are comprehensively applied in the antenna design. For the isolation design of the transmitting and receiving antennas, this article innovatively adopts a defective ground and a novel uneven choke baffle loaded on curved surfaces, which improves the in-band isolation of the transmitting and receiving antennas by at least 20dB. Finally, a prototype was fabricated, capable of generating three beams for both the Tx and Rx arrays, with an isolation exceeding 80 dB across all Tx and Rx beams. The antenna prototype has been applied to the testing of 5G wireless duplex IAB system.