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:
Jan. 08, 2013
Filed:
Sep. 30, 2009
Shogo Inoue, Kawasaki, JP;
Jun Tsutsumi, Kawasaki, JP;
Motoaki Hara, Kawasaki, JP;
Masufumi Iwaki, Kawasaki, JP;
Takashi Matsuda, Kawasaki, JP;
Masanori Ueda, Yokohama, JP;
Shogo Inoue, Kawasaki, JP;
Jun Tsutsumi, Kawasaki, JP;
Motoaki Hara, Kawasaki, JP;
Masufumi Iwaki, Kawasaki, JP;
Takashi Matsuda, Kawasaki, JP;
Masanori Ueda, Yokohama, JP;
Taiyo Yuden Co., Ltd., Tokyo, JP;
Abstract
In a high frequency device, resonators (IDT capacitors) that function as capacitors are included in a lumped constant balun included in a filter or duplexer, and furthermore, the resonance frequency of the IDT capacitors is set higher than the passband frequency of the filter. This improves the capacitor Q value, thus enabling the realization of a low-loss balance filter.