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. 24, 2013
Filed:
Apr. 21, 2010
Guenter Martin, Dresden, DE;
Manfred Weihnacht, Dippoldiswalde, DE;
Sergey Biryukov, Bannewitz, DE;
Alexander Darinski, Moscow, RU;
Bert Wall, Potsdam, DE;
Guenter Martin, Dresden, DE;
Manfred Weihnacht, Dippoldiswalde, DE;
Sergey Biryukov, Bannewitz, DE;
Alexander Darinski, Moscow, RU;
Bert Wall, Potsdam, DE;
Vectron International GmbH & Co. KG, Teltow, DE;
Leibniz-Institut fuer Festkoerper- und Werkstoffforschung Dresden e.V., Dresden, DE;
Abstract
A transducer has natural unidirectionality for surface acoustic waves. An interdigital electrode structure is arranged on a piezoelectric crystal substrate and is constructed with interdigital transducers including collecting electrodes and fingers. At least two of the fingers form a transducer cell, which includes at least one excitation center for exciting an electrical potential wave and at least one reflection center for reflecting electrical potential waves. The fingers are oriented perpendicularly to a direction R parallel to a 1- or 3-fold rotational axis of the substrate crystal and the derivative dv/dθ=0 applies to R, wherein v is the phase velocity of the surface wave and θ is an angular deviation of the perpendicular to the finger direction from the direction R.