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:
Mar. 22, 2005
Filed:
Sep. 23, 2002
Ryoichi Ohara, Kanagawa-ken, JP;
Kazuhide Abe, Kanagawa-ken, JP;
Takashi Kawakubo, Kanagawa-ken, JP;
Hiroshi Yoshida, Kanagawa-ken, JP;
Hiroshi Tsurumi, Kanagawa-ken, JP;
Ryuichi Fujimoto, Kanagawa-ken, JP;
Ryoichi Ohara, Kanagawa-ken, JP;
Kazuhide Abe, Kanagawa-ken, JP;
Takashi Kawakubo, Kanagawa-ken, JP;
Hiroshi Yoshida, Kanagawa-ken, JP;
Hiroshi Tsurumi, Kanagawa-ken, JP;
Ryuichi Fujimoto, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A high frequency filter comprises thin film piezoelectric resonators connected in series between the input/output nodes, thin film piezoelectric resonators connected in parallel between the input/output nodes and a variable voltage circuit adapted to change the voltage applied to at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonators connected in parallel. The resonance characteristic of at least either the thin film piezoelectric resonators connected in series or the thin film piezoelectric resonator connected in parallel is shifted by changing the voltage applied by the variable voltage circuit to change the pass characteristic of the filter.