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. 06, 2007
Filed:
Jul. 11, 2001
Qingxin Su, Xi'an, CN;
Paul B. Kirby, Northampton, GB;
Eiju Komuro, Chiba, JP;
Masaaki Imura, Shizuoka, JP;
Roger W. Whatmore, Milton Keynes, GB;
Qingxin Su, Xi'an, CN;
Paul B. Kirby, Northampton, GB;
Eiju Komuro, Chiba, JP;
Masaaki Imura, Shizuoka, JP;
Roger W. Whatmore, Milton Keynes, GB;
TDK Corporation, Tokyo, JP;
Abstract
Multiple thin film bulk acoustic resonators () configured in series () and parallel () within a coplanar waveguide line structure provides a compact ladder filter. The resonators () are formed over an opening () in a substrate () and connected to associated circuitry by one or more transmission lines formed on the substrate (). The arrangement of the resonators () between the ground and signal lines of a coplanar line structure provides a means of minimising the area of the filter. Embedding a ladder filter within the coplanar transmission line structure eliminates the need for wire bonds, thus simplifying fabrication. Embodiments for 2×2, and hither order filters are described.