The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 22, 2008
Filed:
Aug. 26, 2004
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Bong-shik Song, Kyoto, JP;
Hitomichi Takano, Hirakata, JP;
Susumu Noda, Uji, JP;
Takashi Asano, Kyoto, JP;
Bong-Shik Song, Kyoto, JP;
Hitomichi Takano, Hirakata, JP;
Japan Science and Technology Agency, Kawaguchi-shi, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Abstract
In this electromagnetic wave frequency filter, an electromagnetic wave of a predetermined frequency matching a resonant frequency of a resonatoris transmitted from an input waveguideto an output waveguidethrough the resonator, and is outputted from a drop port P. This filter has an input-waveguide-side reflectorand an output-waveguide-side reflector, which reflect the electromagnetic wave of the predetermined frequency. The electromagnetic wave frequency filter satisfies the following relation:/(1−cos θ)<<,/(1−cos θ)=/(1−cos θ),θ, θ≠2π(=0, 1, . . . ),where θis a phase shift amount of the electromagnetic wave reflected by the input-waveguide-side reflector, θis a phase shift amount of the electromagnetic wave reflected by the output-waveguide-side reflector, Qis a Q-factor between the resonatorand the input waveguide, Qis a Q-factor between the resonatorand the output waveguide, and Qis a Q-factor between the resonatorand free space.