Patent ID: 7697462

Claim:
A method for designing a full duplex communications transceiver to enable a reduction in isolation between a transmit signal and a receive signal at a diplexer, comprising: providing a receiver, a transmitter, and a radio frequency electronics (RFE) front-end comprising a diplexer receive filter located before a low noise amplifier, an RFE receive filter located after the low noise amplifier and coupled to the receiver, a diplexer transmit filter located after a power amplifier, an RFE transmit filter located before the power amplifier and coupled to the transmitter; determining an RFE transmit filter attenuation level sufficient to attenuate a noise power of the transmitter below a thermal noise floor of the power amplifier; determining a minimum diplexer transmit filter attenuation level to attenuate noise power output from the power amplifier in a receive band to a level below a noise floor of the receiver configuring the RFE transmit filter to provide at least the RFE transmit filter attenuation level; and configuring the diplexer transmit filter to provide at least the minimum diplexer transmit filter attenuation level.