| 摘要 |
In this electromagnetic wave frequency filter, an electromagnetic wave of a predetermined frequency matching a resonant frequency of a resonator 4 <SUB>1 </SUB>is transmitted from an input waveguide 2 to an output waveguide 3 through the resonator 4 <SUB>1</SUB>, and is outputted from a drop port P 3 <SUB>1</SUB>. This filter has an input-waveguide-side reflector 21 <SUB>1 </SUB>and an output-waveguide-side reflector 31 <SUB>1</SUB>, which reflect the electromagnetic wave of the predetermined frequency. The electromagnetic wave frequency filter satisfies the following relation: <?in-line-formulae description="In-line Formulae" end="lead"?>Q<SUB>inb</SUB>/(1-cos theta<SUB>1</SUB>)<<Q<SUB>V</SUB>, <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>Q<SUB>inb</SUB>/(1-cos theta<SUB>1</SUB>)=Q<SUB>inr</SUB>/(1-cos theta<SUB>2</SUB>), <?in-line-formulae description="In-line Formulae" end="tail"?> <?in-line-formulae description="In-line Formulae" end="lead"?>theta<SUB>1</SUB>, theta<SUB>2</SUB><>2Npi (N=0, 1, . . . ), <?in-line-formulae description="In-line Formulae" end="tail"?> where theta<SUB>1 </SUB>is a phase shift amount of the electromagnetic wave reflected by the input-waveguide-side reflector 21 <SUB>1</SUB>, theta<SUB>2 </SUB>is a phase shift amount of the electromagnetic wave reflected by the output-waveguide-side reflector 31 <SUB>1</SUB>, Q<SUB>inb </SUB>is a Q-factor between the resonator 4 <SUB>1 </SUB>and the input waveguide 2 , Q<SUB>inr </SUB>is a Q-factor between the resonator 4 <SUB>1 </SUB>and the output waveguide 3 <SUB>1</SUB>, and Q<SUB>v </SUB>is a Q-factor between the resonator 4 <SUB>1 </SUB>and free space.
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