Patent ID: 8743746

Claim:
A radio transceiver, comprising: a multi-band transmitter and a multi-band receiver, where the transmitter and receiver are configured to operate in full duplex with a transmitter channel for use by the transmitter and a receiver channel for use by the receiver; an antenna shared by the transmitter and the receiver for full duplex communication, where the transmitter has an output coupled to the receiver and the receiver has an input coupled to the antenna; a notch filter comprised of one or more integrated capacitors, the notch filter disposed between the antenna and the receiver, where the notch filter is configured to be tuned by varying one or more capacitance values of the one or more integrated capacitors in the notch filter to select the transmitter channel for rejection by the notch filter, at least one of the one or more integrated capacitors comprising Barium Strontium Titanate (BST) ceramic integrated capacitors that are each tuneable by application of a bias voltage thereto; and a filter tuner circuit that is configured to apply the bias voltage to the one or more integrated capacitors, where the bias voltage is initially established as a stored initial value, and where the bias voltage is refined by a proportional-integral-derivative (PID) controller configured to optimize a power in the transceiver.