Abstract
An acoustic wave filter device is disclosed. The device includes an acoustic wave filter element, and a first resonator and a second resonator coupled to the acoustic wave filter element. The acoustic wave filter element includes interdigited input electrodes and output electrodes located on a top surface of a piezoelectric layer and an counter-electrode on the bottom surface of the piezoelectric layer. Each of the first and the second resonators includes a resonator electrode on the top surface of the piezoelectric layer and a resonator counter-electrode on the bottom surface of the piezoelectric layer. The first resonator has a first notch in resonator impedance at a first frequency. The second resonator includes a first mass loading layer on the second resonator electrode such that the second resonator has a second notch in resonator impedance at a second frequency that is different from the first frequency.
Patent family as of 16.12.2021
CN112673568 A 20210416 CN201980058209 20190906
EP3847748 A1 20210714 EP20190765722 20190906
US10790801 BB 20200929 US20180125632 20180907
US2020083862 AA 20200312 US20180125632 20180907
US2021075401 AA 20210311 US20200034711 20200928
WO20049170 A1 20200312 WO2019EP73889 20190906
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| Original language | English |
|---|---|
| Patent number | US2020083862 |
| IPC | H03H 9/ 17 A I |
| Priority date | 7/09/18 |
| Publication status | Published - 12 Mar 2020 |
| MoE publication type | H1 Granted patent |