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:
Dec. 31, 2024
Filed:
Oct. 22, 2020
Vtt Technical Research Centre of Finland Ltd., Espoo, FI;
Markku Ylilammi, Espoo, FI;
Tapani Makkonen, Espoo, FI;
VTT Technical Research Centre of Finland Ltd, Espoo, FI;
Abstract
An acoustic wave filter device with two-stage acoustic wave filters is provided. Each of the two stages includes a respective acoustic wave filter element. A first acoustic wave filter element () includes a first input electrode (), a first output electrode (), and a first counter electrode (). The first input electrode and the first output electrode are located on a top surface of piezoelectric layer (), and the first counter electrode is located on a bottom surface of the piezoelectric layer. A second acoustic wave filter element () includes a second input electrode (), a second output electrode (), and a second counter electrode (). The second input electrode and the second output electrode are located on the top surface of the piezoelectric layer, and the second counter electrode is located on a bottom surface of the piezoelectric layer. The two acoustic wave filter elements are connected in series through a common floating electrode ().