Reactance buffered loop antenna and method for making the same

Details Reactance buffered loop antenna and method for making the same Reactance buffered loop antenna and method for making the same

H - Electricity

01

Q

351/46

H01Q 7/02 (2006.01) H01Q 1/27 (2006.01)

Patent

CA 2004365

23 ABSTRACT A reactance buffer maintains a substantially constant resonant frequency for an adjustable size loop antenna having first and second antenna segments. Each segment has first and second ends, the first ends being coupled to a receiver, and the second ends providing loop size adjustment. The reactance buffer comprises a reactance buffer input coupled to the second end of the first antenna segment. A plurality of taps are linearly disposed along a longitudinal axis of the reactance buffer, the distance between the outermost of the plurality of taps providing a predetermined length corresponding to the length of adjustment of the loop circumference. The taps provide selectable reactance buffer outputs for coupling to the second end of the second antenna segment. A plurality of reactance elements are arranged non-serially between the reactance buffer input and each of the plurality of taps, wherein one or more of the reactance elements are coupled between the input and a corresponding one of the taps to provide a substantially constant reactance when measured between the reactance buffer input and each of the plurality of taps.

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