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:
May. 10, 2005
Filed:
May. 30, 2002
Hiroyuki Nakamura, Katano, JP;
Narihiro Mita, Hirakata, JP;
Shigeru Tsuzuki, Neyagawa, JP;
Toru Yamada, Katano, JP;
Hiroyuki Nakamura, Katano, JP;
Narihiro Mita, Hirakata, JP;
Shigeru Tsuzuki, Neyagawa, JP;
Toru Yamada, Katano, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A longitudinal mode type surface acoustic wave filter comprising a first IDT electrode, second and third IDT electrodes, and first and second reflector electrodes are formed on a piezoelectric substrate. The upper electrode of the first IDT electrode is connected to one of balanced type terminals, and the lower electrode of the first IDT electrode is connected to the other balanced type terminal. Also, the lower electrode of the second IDT electrode is connected to an unbalanced type terminal, and the lower electrode is grounded. The lower electrode of the third IDT electrode is connected to the unbalanced type terminal, and the upper electrode is grounded.