Patent ID: 8102940

Claim:
A receive frequency band interference protection system comprising: an input terminal for receiving an input signal for a transmit frequency band; a dividing coupler coupled to the input terminal, the dividing coupler configured to divide the input signal into a first signal and a second signal; a first signal path comprising: a delay; a second predistortion linearizer coupled to the dividing coupler; a second band-pass filter coupled to the second predistortion linearizer, the second band-pass filter tuned to a transmit frequency band, wherein the first signal path is coupled to the dividing coupler and configured to receive the first signal; a second signal path coupled to the dividing coupler and configured to receive the second signal, the second signal path comprising: an attenuator coupled to the dividing coupler; a predistortion linearizer coupled to the attenuator; and a band-pass filter configured to receive the output of the predistortion linearizer and filter distortion signals outside of a receive frequency band corresponding to the transmit frequency band; a combining coupler coupled to the first signal path and the second signal path, the combining coupler configured to obtain a sum of the respective outputs of the first signal path and the second signal path; and an output terminal coupled to the combining coupler and configured to send out the sum.