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:
Apr. 03, 2007
Filed:
Nov. 24, 2003
Eiju Komuro, Tokyo, JP;
Masaaki Imura, Tokyo, JP;
Qingxin Su, Beijing, CN;
Paul B. Kirby, Northampton, GB;
Roger W. Whatmore, Milton Keynes, GB;
Eiju Komuro, Tokyo, JP;
Masaaki Imura, Tokyo, JP;
Qingxin Su, Beijing, CN;
Paul B. Kirby, Northampton, GB;
Roger W. Whatmore, Milton Keynes, GB;
TDK Corporation, Tokyo, JP;
Abstract
A ladder-type film bulk acoustic resonator (FBAR) filter comprises two series FBARs and two parallel FBARs. Each FBAR has a top electrode, a bottom electrode, and a piezoelectric layer sandwiched between the top and bottom electrodes. The top electrodes of the two series FBARs form part of a signal line of a coplanar waveguide transmission line. The top electrodes of the two series FBARs are connected to associated circuitry. The two series FBARs have a common bottom electrode.