  Recent wireless testbed implementations have proven that full-duplex
communication is in fact possible and can outperform half-duplex systems. Many
of these implementations modify existing half-duplex systems to operate in
full-duplex. To realize the full potential of full-duplex, radios need to be
designed with self-interference in mind. In our work, we use a novel patch
antenna prototype in an experimental setup to characterize the
self-interference channel between transmit and receive radios. We derive an
equivalent analytical baseband model and propose analog baseband cancellation
techniques to complement the RF cancellation provided by the patch antenna
prototype. Our results show that a wide bandwidth, moderate isolation scheme
achieves up to 2.4 bps/Hz higher achievable rate than a narrow bandwidth, high
isolation scheme. Furthermore, the analog baseband cancellation yields a
10-10,000 improvement in BER over RF only cancellation.
