Patent ID: 7941105

Claim:
A radio frequency (RF) reflection cancellation circuit comprising: an RF directional combiner adapted to: receive a power amplifier output signal; provide a first RF output signal based on the power amplifier output signal; receive a first reflected RF output signal; receive an amplified phase-shifted cancellation signal; and combine the amplified phase-shifted cancellation signal with the first reflected RF output signal to substantially cancel the amplified phase-shifted cancellation signal and the first reflected RF output signal; an RF directional splitter adapted to: receive the first RF output signal; provide a second RF output signal based on the first RF output signal; receive a second reflected RF output signal based on the second RF output signal; and split the second reflected RF output signal into a cancellation signal and the first reflected RF output signal; and RF amplifier and phase-shift circuitry adapted to: receive the cancellation signal; and amplify and phase-shift the cancellation signal to provide the amplified phase-shifted cancellation signal.