Systems and methods for duplexer circuits having signal leakage cancellation

A method of duplexing radio frequency signals, the method comprising:

• outputting first and second radio frequency transmit signals onto respective first and second parallel transmit paths extending between a power amplifier and an antenna;
• applying a first phase shift to the first radio frequency transmit signal between the power amplifier and a first duplexer on the first transmit path;
• outputting first and second radio frequency receive signals onto respective first and second parallel receive paths extending between the antenna and a receive splitter;
• applying a second phase shift to the first radio frequency receive signal between the antenna and a second duplexer on the first receive path;
• and
• applying a third phase shift to the second radio frequency receive signal between the first duplexer and the receive splitter on the second receive path.

A radio frequency system comprising:

• at least one antenna configured to transmit a radio frequency transmit signal and receive a radio frequency receive signal;
• a baseband processor configured to generate the radio frequency transmit signal and receive the radio frequency receive signal from the antenna;
• and
• a front end system coupling the baseband processor to the antenna, the front end system including a transmit path splitter configured to split a radio frequency transmit signal into a pair of radio frequency transmit signals, a receive path splitter configured to combine a pair of radio frequency receive signals, an antenna path splitter configured to combine the pair of radio frequency transmit signals and split a radio frequency receive signal into the pair of radio frequency receive signals, a first duplexer coupled to a first leg of each of the transmit path splitter, the receive path splitter, and the antenna path splitter, and a second duplexer coupled to a second leg of each of the transmit path splitter, the receive path splitter, and the antenna path splitter.