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:
Jan. 15, 1985
Filed:
Mar. 16, 1983
U.S. Philips Corporation, New York, NY (US);
Abstract
N.sup.2 acoustic wave devices (A,B,S,T; where N is an integer greater than unity) with substantially the same electrical impedance and transfer characteristics at a given operating frequency are electrically connected in a parallel-series arrangement which has substantially the same electrical impedance and transfer characteristics as any one of the individual N.sup.2 devices, but an increased active device area. The increased active area reduces stress and alleviates acoustically-induced migration in the metal of, for example, transducer electrode fingers (6,7) of resonators at high power levels. The parallel-series arrangement consists of N groups, each of which comprises N devices (A,B or S,T), the corresponding pairs of terminals (4,54 and 54,55) of which are connected in series. Some terminals (54 or 55) may be common to two or more devices and some devices may have merged transducers in which the electrode fingers (6 or 7) of one transducer are a longitudinal extension of the fingers of a parallel transducer. In the case of multi-port devices the input and output terminal pairs may be differently grouped as regards the individual devices to which they belong.