Siemens Aktiengesellschaft

Siemens Matsushita Comp. Gmbh & Co Kg

Bernd Fleischmann

Peter Zibis

Gerd Riha

A surface-wave-type reflective delay line includes an input/output interdigital converter, and a plurality of surface wave reflectors. The surface wave reflectors are disposed at positions corresponding to an order of magnitude of half of a particular desired transit time of a surface wave between the input/output interdigital converter and an applicable surface wave reflector and back. At least some of the surface wave reflectors are each shifted by a mathematically random value out of the positions corresponding to half the particular desired transit time.

Surface-wave-type reflective delay line

An SW resonator has a substrate of piezoelectric material. Two reflectors are applied onto the one substrate side. Input and output transducers are situated between the reflectors. The SW resonator is expanded to form an SW resonator having three electrical gates by arranging an additional transducer between the reflectors.

Surface wave resonator system having additional transducer between

Surface wave arrangement with conversion structure for preventing

A transducer for a filter arrangement with acoustic waves which includes a transducer 1 and 2 comprising groups (3, 4, 6 and 7) of alternating interdigitally spaced electrode fingers (10) in which the neighboring groups (3, 4 or, respectively, 4, 3 or, respectively, 6, 7) are arranged so that they are 80 degrees out of phase relative to each other at the fundamental frequency of the groups.

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Munich, Germany

Bernd Fleischmann