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:
Oct. 28, 2008
Filed:
Feb. 20, 2004
Kiyomichi Araki, Tokyo, JP;
Hitoshi Ishida, Tokyo, JP;
Takao Nakagawa, Tokyo, JP;
Abstract
In order to provide a band pass filter for high wavelength which has a wideband, small insertion loss and flat passband and obtains steep attenuation, a plurality of ring filters, in which, an input terminal of a high-frequency signal is provided to an arbitrary point on a line in a microstripline ring resonator having the line with one wavelength at electrical length, an output terminal is provided to a point positioned at a half wavelength at electrical length from the input terminal, a open stub of ¼ wavelength at electrical length (or ½ wavelength short stub) is connected to a point positioned at ¼ wavelength at electrical length from the input terminal, are connected by cascade connection with attenuation pole frequencies being different.