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:
Nov. 01, 2005
Filed:
Sep. 24, 2003
Kazushige Noguchi, Tokyo, JP;
Satoshi Terada, Yokohama, JP;
Wataru Ohashi, Tokyo, JP;
Tomokazu Komazaki, Hachioji, JP;
Kazushige Noguchi, Tokyo, JP;
Satoshi Terada, Yokohama, JP;
Wataru Ohashi, Tokyo, JP;
Tomokazu Komazaki, Hachioji, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A high-performance SAW filter is to be provided which has lower insertion loss in a pass band and high attenuation in an attenuation band on the low frequency side of the pass band. In a SAW filter with attenuation poles configured of a two-port circuit for filtering for forming a ladder type SAW filter using a SAW resonator and a two-port circuit for impedance formed of an impedance serially connected, the impedance of the two-port circuit for impedance is configured so as to form an attenuation band of a predetermined width having a sufficient attenuation characteristic on the low frequency side of a pass band.