Unlicensed bands offer great opportunities for wireless communications, especially in the 60 GHz band which has stayed relatively free from mass-market applications. Low-power short-range point-to-point links, in particular, are a very attractive application because of the large available bandwidths and considerable atmospheric losses in this band. A system implementing in-band full-duplex in such context could yield data rates close to 10 Gbit/s, offering a great solution for contactless testing and connector-free board-to-board communications. The goal of this study is to build a solution with small footprint providing enough self-interference suppression to enable a low-power short-range in-band full-duplex link at 60 GHz. This work addresses various solutions to this problem, and especially the use of dual-polarized antenna architectures with high isolation between transmitter and receiver.
