Abstract
The invention relates to a laterally coupled bulk acoustic wave (LBAW) filter comprising a vibration layer for carrying bulk acoustic waves, electrode means comprising a first electrode coupled to the vibration layer for exciting to the vibration layer at least one longitudinal wave mode having a first frequency band and one shear wave mode having a second frequency band, and a second electrode coupled to the vibration layer for sensing the filter pass signal, the first and second electrodes being laterally arranged with respect to each other, and an acoustic reflector structure in acoustic connection with the vibration layer. According to the invention, the reflector structure is adapted to acoustically isolate the vibration layer from its surroundings at the first frequency band more efficiently than at the second frequency band for suppressing the effect of the shear wave mode at the second frequency band from the filter pass signal. The invention helps to improve the quality of LBAW filter passbands.
Patent family as of 7.10.2021
CN104205632 A 20141210 CN201280066944 20121109
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EP2777153 A4 20151223 EP20120847501 20121109
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JP2015502065 T2 20150119 JP20140540529T 20121109
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KR101977334 B1 20190510 KR20147015834 20121109
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US2014312994 AA 20141023 US20120357220 20121109
US9219466 BB 20151222 US20120357220 20121109
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| Original language | English |
|---|---|
| Patent number | US2014312994 |
| IPC | H03H 9/ 54 A I |
| Priority date | 9/11/12 |
| Publication status | Published - 23 Oct 2014 |
| MoE publication type | H1 Granted patent |