Undesired signal canceller

An undesired signal canceller for a radient energy receiver comprising first and second antennas spaced a distance (d) apart, a phase compensation circuit connected to said first antenna, a variable phase shift circuit connected to said second antenna, said variable phase shift circuit comprising a plurality of series connected inductors and a plurality of voltage variable capacitors with adjacent ones of said plurality of voltage variable capacitors connected between ground and the junction points between adjacent ones of said series connected inductors, adding means connected to the outputs of said phase compensation circuit and said variable phase shift circuit and means for supplying a variable D.C. voltage to said voltage variable capacitors to control their capacitance, including first and second capacitors connected at the input and output respectively of said plurality of series connected inductors, a plurality of capacitors with one connected in series between ground and each of said voltage variable capacitors, adjacent ones of said voltage variable capacitors poled to pass current in opposite directions, a first fixed bias means connected to said series connected inductors, a first variable bias means connected to the first, third and odd alternate ones of said voltage variable capacitors and a second variable bias means connected to the second, fourth and even alternate ones of said voltage variable capacitors.