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:
Sep. 29, 1992
Filed:
Dec. 13, 1990
Applicant:
Inventors:
Kazuyuki Noto, Kurobe, JP;
Isao Toyoshima, Ishikawa, JP;
Assignee:
Murata Manufacturing Co., Nagaokakyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ;
U.S. Cl.
CPC ...
333189 ; 333192 ;
Abstract
In a trap circuit a plurality of cascade-connected three-terminal piezoelectric ceramic resonators having different resonance frequencies, an inductor is connected between input and output terminals of only the resonator having the lowest resonance frequency, and a resistor is connected between input and output terminals of each remaining resonator, so that large attenuation is attained at the respective resonance frequencies and a large attenuation is attained in intermediate regions between the resonance frequencies. Thus, unwanted signals can be eliminated over a large bandwidth.