Electromagnetic wave frequency filter
US7321707B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 26, 2004 |
| Grant date | Jan 22, 2008 |
| Priority date | — |
| Expiry date | Sep 22, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2006/12164
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.