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Electromagnetic wave frequency filter

  • US 7,321,707 B2
  • Filed: 08/26/2004
  • Issued: 01/22/2008
  • Est. Priority Date: 08/29/2003
  • Status: Expired due to Fees
First Claim
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1. An electromagnetic wave frequency filter comprising:

  • an input waveguide configured to receive electromagnetic waves of a plurality of frequencies inputted into a one end of said input waveguide;

    an output waveguide disposed alongside said input waveguide; and

    a resonator disposed between said input waveguide and said output waveguide, said resonator having a resonant frequency and resonating with an electromagnetic wave of a predetermined frequency matching the resonant frequency so as to transmit said electromagnetic wave from said input waveguide to said output waveguide, thereby allowing said electromagnetic wave to be emitted from a drop port of a one end of said output waveguide,whereinsaid input waveguide has an input-waveguide-side reflector for reflecting said electromagnetic wave of the resonant frequency on the opposite side of said one end of the input waveguide from the resonator,said output waveguide having an output-waveguide-side reflector for reflecting the electromagnetic wave of the predetermined frequency on the opposite side of said one end of the output waveguide,said electromagnetic wave frequency filter satisfying the following relation;


    Qinb/(1 cos θ

    1)<

    <

    Qv,
    Qinb/(1 cos θ

    1)=Qinr/(1 cos θ

    2),
    θ

    1, θ

    2

    2Nπ

    (N=0, 1, . . . ),where θ

    1 is a phase shift amount of the electromagnetic wave reflected by said input-waveguide-side reflector and returned to near said resonator, θ

    2 is a phase shift amount of the electromagnetic wave reflected by said output-waveguide-side reflector and returned to near said resonator, Qinb is a Q-factor between said resonator and said input waveguide, Qinr is a Q-factor between said resonator and said output waveguide, and Qv is a Q-factor between said resonator and free space.

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