Antenna-plexer for interference cancellation

A front end system comprising:

• an antenna-plexer including a first high pass section, a low pass section, and a second high pass section;
• a first multi-throw switch including a first terminal connected to the low pass section and a second terminal connected to the second high pass section;
• an antenna port connected to both the first high pass section and the low pass section, the antenna port configured to receive a first radio frequency transmit signal through the low pass section from the first terminal of the first multi-throw switch;
• and
• a feedback port configured to output a radio frequency feedback signal received from the second high pass section of the antenna-plexer.