Disclosed is a ultrasonic transducer array comprising a ceramic connector having an array of connector pads, a mismatching layer of electrically conducting material connected to the upper surface of the ceramic connector, a piezoelectric transducer chip connected to the mismatching layer, separation...http://www.google.de/patents/US5311095?utm_source=gb-gplus-sharePatent US5311095 - Ultrasonic transducer array
