Transducer having natural unidirectionality for surface acoustic waves

US8614534B2 · kind B2 · utility

Assignees

• Vectron International GmbH & Co. KG · DE
• Leibniz-Institut für Festkörper- und, Werkstoffforschung Dresden e. V. · DE

Inventors

• Guenter Martin
• Manfred Weihnacht · Malter, DE
• Sergey Biryukov · Moskovskiy, RU
• Alexander Darinski · Moscow, RU
• Bert Wall · Potsdam, DE

Key dates

• Filing date: Apr 21, 2010
• Grant date: Dec 24, 2013
• Expiry date: May 4, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H9/14505
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

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.