Electromagnetic wave frequency filter
First Claim
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, wherein said 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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Accused Products
Abstract
In this electromagnetic wave frequency filter, an electromagnetic wave of a predetermined frequency matching a resonant frequency of a resonator 41 is transmitted from an input waveguide 2 to an output waveguide 3 through the resonator 41, and is outputted from a drop port P31. This filter has an input-waveguide-side reflector 211 and an output-waveguide-side reflector 311, which reflect the electromagnetic wave of the predetermined frequency. The electromagnetic wave frequency filter satisfies the following relation:
Qinb/(1−cos θ1)<<QV,
Qinb/(1−cos θ1)=Qinr/(1−cos θ2),
θ1, θ2≠2Nπ (N=0, 1, . . . ),
where θ1 is a phase shift amount of the electromagnetic wave reflected by the input-waveguide-side reflector 211, θ2 is a phase shift amount of the electromagnetic wave reflected by the output-waveguide-side reflector 311, Qinb is a Q-factor between the resonator 41 and the input waveguide 2, Qinr is a Q-factor between the resonator 41 and the output waveguide 31, and Qv is a Q-factor between the resonator 41 and free space.
11 Citations
16 Claims
-
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, wherein said 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification