Low velocity surface acoustic wave device

A method of providing a reduced velocity surface acoustic wave device, comprising:

• disposing an interdigital transducer on a piezoelectric substrate, the interdigital transducer including a pair of busbars disposed on opposite edges of the piezoelectric substrate, each busbar having a plurality of electrode fingers extending therefrom towards an opposing busbar, the plurality of electrode fingers of each busbar interleaving with one another within a first region of the reduced velocity surface acoustic wave device and forming a gap region between an end of one of the plurality of electrode fingers and the opposing busbar, the first region including a central region and two edge regions, each edge region extending from a tip of one of the plurality of electrode fingers towards a center of the central region;
• disposing a temperature compensation layer on the interdigital transducer;
• and
• disposing a low velocity material layer within the temperature compensation layer, the low velocity material layer wholly covering the first region and extending only partially into the gap region of the reduced velocity surface acoustic wave device.

A front end module for installation in a wireless device, comprising a low velocity surface acoustic wave device, the low velocity surface acoustic wave device including:

• a piezoelectric substrate;
• an interdigital transducer disposed on the piezoelectric substrate and configured to generate a surface acoustic wave in response to an electrical signal, the interdigital transducer including a pair of busbars disposed on opposite edges of the piezoelectric substrate, each busbar having a plurality of electrode fingers extending therefrom towards an opposing busbar, the plurality of electrode fingers of each busbar interleaving with one another within a first region of the low velocity surface acoustic wave device and forming a gap region between an end of one of the plurality of electrode fingers and the opposing busbar, the first region including a central region and two edge regions, each edge region extending from a tip of one of the plurality of electrode fingers towards a center of the central region;
• and
• a temperature compensation layer disposed on the interdigital transducer and on the piezoelectric substrate, the temperature compensation layer having a low velocity material layer disposed within it and configured to reduce a velocity of a surface acoustic wave generated by the interdigital transducer, the low velocity material layer wholly covering the first region and extending only partially into the gap region of the low velocity surface acoustic wave device.