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Multi-band impedance tuners using weakly-coupled LC resonators

  • US 9,871,499 B2
  • Filed: 11/26/2014
  • Issued: 01/16/2018
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. A radio frequency (RF) filter structure, comprising:

  • a first terminal;

    a second terminal;

    a first tunable RF filter path defined between the first terminal and the second terminal, wherein the first tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a first frequency and wherein the first tunable RF filter path comprises a first subset of the plurality of resonators wherein at least a pair of the first subset of the plurality of resonators are weakly coupled to one another;

    a second tunable RF filter path defined between the first terminal and the second terminal, wherein the second tunable RF filter path is configured to be tunable to provide impedance matching between the first terminal and the second terminal at a second frequency and wherein the second tunable RF filter path comprises a second subset of the plurality of resonators; and

    wherein the first subset of the plurality of resonators and the second subset of the plurality of resonators are not mutually exclusive.

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