BULK ACOUSTIC RESONATOR
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United States of America
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Issued Date -
Oct 31, 2024
app pub date -
Mar 18, 2024
filing date -
Mar 18, 2024
priority date (Note) -
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Abstract
A bulk acoustic resonator includes an active region in which a first electrode disposed on a substrate, a piezoelectric layer disposed on the first electrode in a height direction, and a second electrode disposed on the piezoelectric layer in the height direction overlap each other in the height direction; a peripheral region in which the first electrode or the second electrode extends outwardly from the active region so that the first electrode and the second electrode do not overlap each other in the height direction in the peripheral region; and an auxiliary layer disposed in the peripheral region, wherein a first cutoff frequency of the active region is substantially equal to a second cutoff frequency of the peripheral region.
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