Hybrid-based cancellation in presence of antenna mismatch

A multi-port hybrid-based cancellation network comprising

• a first hybrid coupler having a first port, a second port, a third port, and a fourth port;
• a second hybrid coupler that is distinct from the first hybrid coupler, the second hybrid coupler having a fifth port, a sixth port, a seventh port, and an eighth port;
• a first two-port network connected between the first port of the first hybrid coupler and the fifth port of the second hybrid coupler;
• a second two-port network that is distinct from, but essentially similar to the first two-port network, connected between the second port of the first hybrid coupler and the sixth port of the second hybrid coupler;
• a third two-port network that is distinct from the first and the second two-port networks connected to the third port of the first hybrid coupler;
• an antenna having an antenna impedance connected to the fourth port of the first hybrid coupler;
• and
• a load having a load impedance connected to the eighth port of the second hybrid coupler, the load having a load reflection coefficient matched to the antenna impedance with a phase that is 180° different than that of the antenna impedance at bandpass frequencies of the first two-port network and the second two-port network.