Nan Wu

US Patent:

20220209747, Jun 30, 2022

Filed:

Dec 13, 2021

Appl. No.:

17/549629

Inventors:

- Irvine CA, US
Jiansong Liu - Fremont CA, US
Nan Wu - Irvine CA, US

International Classification:

H03H 9/54
H03H 9/17
H03H 9/13
H03H 9/02

Abstract:

A filter is disclosed. The filter can be a band pass filter or a band rejection filter. The filter can have bulk acoustic wave resonators. The filter can include a shunt bulk acoustic wave resonator and a series bulk acoustic wave resonator. The shunt bulk acoustic wave resonator and the series bulk acoustic wave resonator include different raised frame structures. The different raised frame structures contribute to one of the shunt bulk acoustic wave resonator or the series bulk acoustic wave resonator to have a higher quality factor below a resonant frequency than the other.

US Patent:

20220209749, Jun 30, 2022

Filed:

Dec 13, 2021

Appl. No.:

17/549511

Inventors:

- Irvine CA, US
Jiansong Liu - Fremont CA, US
Nan Wu - Irvine CA, US

International Classification:

H03H 9/64
H03H 9/62

Abstract:

A filter with bulk acoustic wave devices is disclosed. The filter includes a first bulk acoustic wave resonator and a second bulk acoustic wave resonator. The first bulk acoustic wave resonator includes a first raised frame structure. The first raised frame structure is a multi-layer raised frame structure. The second bulk acoustic wave resonator includes a second raised frame structure. The first raised frame structure has at least one more raised frame layer than the second raised frame structure.