Boundary acoustic wave device
AssigneeMurata Manufacturing Co., Ltd.
InventorHajime KANDO
Life of this patent
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Abstract
A boundary acoustic wave device includes a stacked structure including a second medium, an IDT electrode, and a first medium, the stacked structure including the first medium having a temperature coefficient of group delay time TCD that is positive. The IDT electrode is stacked on the first medium. The second medium is stacked on the first medium so as to cover the IDT electrode and has a temperature coefficient of group delay time TCD that is negative. A third medium having an acoustic velocity of a transverse wave that is less than an acoustic velocity of a transverse wave of the second medium is arranged at least on a top surface of the IDT electrode.
Claims4
A boundary acoustic wave device comprising:
- a stacked structure including a second medium, an IDT electrode, and a first medium;
- wherein
- the first medium has a temperature coefficient of group delay time TCD that is positive;
- the IDT electrode is stacked on the first medium;
- the second medium is stacked on the first medium so as to cover the IDT electrode and having a temperature coefficient of group delay time TCD that is negative;
- and
- a third medium is arranged at least on a top surface of the IDT electrode, the third medium being made of a dielectric material having an acoustic velocity of a transverse wave that is less than an acoustic velocity of a transverse wave of the second medium.
Dependencies are inferred from the claim text.