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:
Jun. 10, 2008
Filed:
Dec. 21, 2005
Applicants:
Nobuhiko Shibagaki, Kokubunji, JP;
Mitsutaka Hikita, Hachioji, JP;
Inventors:
Nobuhiko Shibagaki, Kokubunji, JP;
Mitsutaka Hikita, Hachioji, JP;
Assignee:
Hitachi Media Electronics Co., Ltd., Iwate-ken, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03H 9/70 (2006.01); H03H 9/54 (2006.01); H03H 9/64 (2006.01);
U.S. Cl.
CPC ...
Abstract
A resonator is connected in parallel to at least one serial-arm-connected resonator in a resonator type filter having a serial arm and a parallel arm. At this time, the resonance frequency of the resonator connected in parallel is set to be substantially the same as the resonance frequency of the parallel-arm-connected resonator. This makes it possible to prevent the deterioration of attenuation levels at the lower-frequency side of the filter, caused by an increase in the resistance of a connection element due to an increase in packaging density.