Patent ID: 9748916
Date: 2017-08-29
CPC Classifications: H03H,H04L

Claim:
1. An adaptive filter comprising: a tunable filter having an input node and an output node, the tunable filter being selectively tunable to define a pass band associated with a first signal band and a reject band associated with a second signal band, wherein the tunable filter is configured to pass signals having frequencies within the first signal band between the input node and the output node, and wherein the tunable filter is configured to block signals having frequencies within the second signal band between the input node and the output node; wherein the tunable filter comprises one or more coupling impedance elements, the one or more coupling impedance elements comprising one or more inductors connected in series between the input node and the output node; wherein the tunable filter is tunable both to a first mode at which a coupling impedance of the tunable filter between the input node and the output node is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are less than frequencies within the reject band and to a second mode at which the coupling impedance of the tunable filter between the input node and the output node is tuned such that the pass band has a minimum pass band insertion loss at frequencies that are greater than frequencies within the reject band; and wherein the one or more coupling impedance elements are tunable to vary the frequencies at which the minimum pass band insertion loss is achieved within the pass band.