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. 14, 2026
Filed:
Sep. 18, 2023
Rf360 Singapore Pte. Ltd., Singapore, SG;
Veit Meister, Unterhaching, DE;
Maximilian Schiek, Puchheim, DE;
Juha Sakari Ella, Turku, FI;
Edgar Schmidhammer, Stein an der Traun, DE;
Christian Ceranski, Munich, DE;
RF360 Singapore Pte. Ltd., Republic Plaza, SG;
Abstract
BAW devices include a piezoelectric layer with a first electrode layer on one face and a second electrode layer on the opposite face. The piezoelectric layer and electrode layers determine a coupling efficiency of the BAW devices, which is a measure of the acoustic response of the piezoelectric layer to an input signal. In a BAW device, a first side of the first electrode layer comprises a first material adjacent to a first face of the piezoelectric layer, and a second side of the first electrode layer, opposite to the first face of the piezoelectric layer, comprises a second material, where the first material and the second material have different acoustic impedances. An electrode layer with an acoustic impedance gradient increases the coupling efficiency of the BAW devices.