Patent ID: 7738654

Claim:
A method for isolating a received signal using a isolation circuit from a channel also carrying a transmitted signal comprising: receiving an incoming signal from a channel at the isolation circuit; receiving an outgoing signal at the isolation circuit, the outgoing signal to be sent over the channel; filtering the outgoing signal with a first filter to perform frequency specific modification or manipulation of phase to create a first filtered outgoing signal; filtering the outgoing signal with a second filter to perform frequency specific modification or manipulation of phase to create a second filtered outgoing signal; providing the first filtered outgoing signal and the second filtered outgoing signal to a differencing device; filtering the incoming signal with the first filter and the second filter to create a filtered incoming signal; providing the filtered incoming signal and the incoming signal to a differencing device; and outputting the incoming signal from the differencing device, wherein the first filtered outgoing signal and the second filtered outgoing signal cancel in the differencing device.