| 主权项 |
1. An elastic wave device comprising:
a piezoelectric substrate; a low-frequency filter formed on the piezoelectric substrate, and having a low-frequency passband; a high-frequency filter formed on the piezoelectric substrate, and having a high-frequency passband higher than the low-frequency passband; and a terminal connected to the low-frequency filter and the high-frequency filter,wherein the low-frequency filter has a first elastic wave resonator connected to the terminal,wherein the first elastic wave resonator has a plurality of interdigital transducers disposed between a pair of reflectors,wherein at least one of the pair of reflectors has a first region and a second region, and the second region has a third region and a fourth region,wherein the first region is located nearer to the interdigital transducers of the reflectors, while the second region is located farther from the interdigital transducers of the reflectors,wherein the third region is located nearer to the interdigital transducers in the second region, while the fourth region is located farther from the interdigital transducers in the second region,wherein a reflection band in the first region covers the low-frequency passband,wherein a reflection band in the second region covers the high-frequency passband, andwherein a center frequency of the reflection band in the fourth region is lower than a center frequency of the reflection band of the third region.
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