×

Tunable filter

  • US 7,573,356 B2
  • Filed: 02/22/2007
  • Issued: 08/11/2009
  • Est. Priority Date: 02/28/2006
  • Status: Expired due to Fees
First Claim
Patent Images

1. A tunable filter, comprising:

  • an input/output line formed on a dielectric substrate;

    at least two coupling sections inserted in series in the input/output line at a distance from each other in the longitudinal direction of the input/output line, each of the coupling sections including a gap dividing the input/output line in a width direction thereof, and one or more coupling electrodes arranged in the gap in the longitudinal direction of the input/output line;

    a resonator connected to the input/output line between every adjacent two of said coupling sections and configured to vary a resonance frequency thereof;

    switch means for performing at least one of selective grounding of the coupling electrodes of the coupling sections and selective short-circuiting among the coupling electrodes or between the coupling electrodes and the input/output line to vary a frequency bandwidth of each coupling section; and

    resonance frequency varying means for varying the resonance frequency of the resonator in association with the switch means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×