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Filter with improved stop/pass ratio

  • US 5,739,735 A
  • Filed: 03/22/1996
  • Issued: 04/14/1998
  • Est. Priority Date: 03/22/1995
  • Status: Expired due to Fees
First Claim
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1. A resonator coupling comprising:

  • a transmission line resonator having an upper end which is open-circuited, a lower end which is short-circuited, and a length substantially equal to a quarter wavelength of its resonant frequency;

    a transmission line for coupling to the resonator;

    a tap point at which the transmission line and the transmission line resonator are in direct contact with each other, said transmission line resonator is divided at the tap point into a first lower part and a second upper part; and

    a coupling element in parallel with said transmission line resonator at said tap point and being electromagnetically coupled to said transmission line resonator.

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