Patent ID: 11962288
Assignee: SOITEC
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A surface elastic wave filter with resonant cavities, comprising:
a composite substrate formed of a base substrate and a piezoelectric upper layer;
at least one input electroacoustic transducer and at least one output electroacoustic transducer, disposed on the piezoelectric upper layer;
at least one internal reflective structure, arranged between the at least one input electroacoustic transducer and the at least one output electroacoustic transducer, the at least one internal reflective structure comprising:
a first structure comprising at least one reflection grating having a first period;
a second structure comprising at least one reflection grating having a second period, the first period being greater than the second period;
wherein:
the at least one reflection grating of the first structure comprises a first plurality of reflection gratings separated from each other by a first distance; and
the at least one reflection grating of the second structure comprises a second plurality of reflection gratings separated from each other by a second distance; wherein the first distance is less than the second distance.