Transducer structure for an acoustic wave device

A transducer structure for an acoustic device, comprising:

• a piezoelectric layer;
• a pair of inter-digitated comb electrodes, comprising a plurality of electrode means with a pitch p;
• wherein the electrode means of the inter-digitated comb electrodes are embedded in the piezoelectric layer, and the acoustic impedance of the electrode means is less than the acoustic impedance of the piezoelectric layer;
• wherein the embedded electrodes means are filled into grooves in the piezoelectric layer;
• and wherein the sidewalls and bottom walls of the grooves are covered with a conductive material and the remainder of the grooves are filled with a dielectric material.

A transducer structure for an acoustic device, comprising:

• a piezoelectric layer;
• a pair of inter-digitated comb electrodes, comprising a plurality of electrode means with a pitch p;
• wherein the electrode means of the inter-digitated comb electrodes are embedded in the piezoelectric layer, and the acoustic impedance of the electrode means is less than the acoustic impedance of the piezoelectric layer;
• wherein the embedded electrodes means are filled into grooves in the piezoelectric layer;
• wherein the grooves extend through the piezoelectric layer and the sidewalls of the grooves are covered by a conductive material and the remainder of the grooves is filled with a dielectric material.