Patch antenna design for full-duplex transceivers

We present the design, implementation and validation (by measurements) of a two-element antenna array for inband full-duplex (FD) applications. The antenna array is designed to provide large isolation between its transmission and reception ports by changing the polarization of the channels and by designing a suitable radiation pattern for the transmission antennas. Especially, the design of the antenna array is developed by tuning the characteristic S-parameters of the antenna elements so that isolation levels larger than 55 dB are achieved without degrading the far-field transmission pattern. Simulation and measurement results show that the proposed antenna design could be a promising solution for full-duplex applications, i.e., FD access points and/or FD sensing nodes in cognitive radio systems.