Patent ID: 6029324
Filing Date: 2000-02-29
Classification: H03H

Abstract:
An acoustical-electronic component operating with acoustical surface waves, comprising:a piezoelectric substrate in which an acoustical surface wave is guided;a first interdigital transducer provided on said piezoelectric substrate;a second interdigital transducer provided on said piezoelectric substrate, the acoustical surface wave being guided along a travel path between said first interdigital transducer and said second interdigital transducer;a quasi-two-dimensional electron system disposed on said piezoelectric substrate in the travel path of the acoustical surface wave and interacting with the acoustical surface wave, said quasi-two-dimensional electron system having an electrical conductivity and being provided with an ohmic contact; anda field effect electrode tuning the electrical conductivity of said quasi-two-dimensional electron system substantially loss-free and without a charge transfer along the travel path by voltage-control for varying a transit time of the acoustical surface wave between said first interdigital transducer and said second interdigital transducer.