Reflective structure for surface acoustic wave devices (SAW)

A surface acoustic wave (SAW) device, comprising:

• an acoustic wave propagating substrate;
• an interdigitated transducer structure on or in the acoustic wave propagating substrate, the interdigitated transducer structure comprising a first material;
• and
• at least one acoustic wave reflective structure on or in the acoustic wave propagating substrate, the at least one acoustic wave reflective structure comprising a plurality of parallel strips, the strips of the at least one acoustic wave reflective structure being made of a second material;
• wherein:
• the second material is a dielectric material;
• and
• the second material is different from the first material and/or the acoustic wave reflective structure and the interdigitated transducer structure have different geometrical parameters.

A surface acoustic wave (SAW) device, comprising:

• an acoustic wave propagating substrate;
• an interdigitated transducer structure on or in the acoustic wave propagating substrate, the interdigitated transducer structure comprising a first material;
• and
• at least one acoustic wave reflective structure on or in the acoustic wave propagating substrate, the at least one acoustic wave reflective structure comprising a second material;
• wherein:
• the at least one acoustic wave reflective structure comprises a first acoustic wave reflective structure on one side of the interdigitated transducer structure and a second acoustic wave reflective structure on an opposing side of the interdigitated transducer structure;
• and
• the first acoustic wave reflective structure comprises a material differing from a material of the second acoustic wave reflective structure and/or the first acoustic wave reflective structure has a pitch differing from a pitch of the second acoustic wave reflective structure.