Elastic wave device
First Claim
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1. An elastic wave device comprising:
- a piezoelectric substrate; and
an electrode pattern provided on a surface of the piezoelectric substrate and defining elastic wave filters;
whereinthe electrode pattern includes;
n filter electrodes disposed along a first direction where n is an integer that satisfies n≥
3;
a first terminal electrode and a second terminal electrode corresponding to each of the n filter electrodes; and
a ground terminal electrode corresponding to each of the n filter electrodes;
the n filter electrodes include;
a first filter electrode at a first end of the piezoelectric substrate in the first direction, a second filter electrode at a second end of the piezoelectric substrate in the first direction, and a third filter electrode different from the first and second filter electrodes;
the ground terminal electrode corresponding to the third filter electrode is disposed between the third filter electrode and a filter electrode of the n filter electrodes adjacent to the third filter electrode; and
no other filter electrode is disposed between the first filter electrode at the first end of the piezoelectric substrate and the ground terminal electrode connected thereto, between the second filter electrode at the second end of the piezoelectric substrate and the ground terminal electrode connected thereto, and between the third filter electrode and the ground terminal electrode connected thereto.
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Abstract
An elastic wave device includes a piezoelectric substrate, filter electrodes, input terminal electrodes, output terminal electrodes, and ground terminal electrodes. The filter electrodes are disposed along a first direction. The ground terminal electrodes corresponding to the filter electrodes are respectively disposed between adjacent filter electrodes, and are common to the adjacent filter electrodes.
6 Citations
12 Claims
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1. An elastic wave device comprising:
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a piezoelectric substrate; and an electrode pattern provided on a surface of the piezoelectric substrate and defining elastic wave filters;
whereinthe electrode pattern includes; n filter electrodes disposed along a first direction where n is an integer that satisfies n≥
3;a first terminal electrode and a second terminal electrode corresponding to each of the n filter electrodes; and a ground terminal electrode corresponding to each of the n filter electrodes; the n filter electrodes include; a first filter electrode at a first end of the piezoelectric substrate in the first direction, a second filter electrode at a second end of the piezoelectric substrate in the first direction, and a third filter electrode different from the first and second filter electrodes; the ground terminal electrode corresponding to the third filter electrode is disposed between the third filter electrode and a filter electrode of the n filter electrodes adjacent to the third filter electrode; and no other filter electrode is disposed between the first filter electrode at the first end of the piezoelectric substrate and the ground terminal electrode connected thereto, between the second filter electrode at the second end of the piezoelectric substrate and the ground terminal electrode connected thereto, and between the third filter electrode and the ground terminal electrode connected thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification