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. 29, 1980
Filed:
Jun. 30, 1978
Applicant:
Inventor:
Donald C Malocha, Plano, TX (US);
Assignee:
University of Illinois Foundation, Urbana, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03H / ; H03H / ; H03H / ; H01L / ;
U.S. Cl.
CPC ...
333194 ; 310313 ; 333151 ; 333196 ;
Abstract
A surface acoustic wave device having a unidirectional input transducer is provided with an input tuning circuit which eliminates the reactive portions of the device's input impedance. The input transducer has a pair of input ports, each of which exhibits an impedance A.angle..phi.. A series tuning circuit including reactances having a magnitude of A(sin.phi.+cos.phi.) and A(sin.phi.-cos.phi.) respectively, is connected to the input ports. An alternative parallel reactive tuning circuit is disclosed whose reactances are A/(sin.phi.+cos.phi.) and A/(sin.phi.-cos.phi.) respectively.