US 12,316,302 B2
Hybrid band-pass filter with integrated passive device and acoustic resonator
Dror Hurwitz, Tianjin (CN); Chuanxiang Dai, Tianjin (CN); and Ming Tian, Tianjin (CN)
Filed by Zhuhai Crystal Resonance Technologies Co., Ltd., Tianjin (CN)
Filed on Oct. 28, 2022, as Appl. No. 17/975,898.
Prior Publication US 2024/0113694 A1, Apr. 4, 2024
Int. Cl. H03H 9/54 (2006.01); H03H 9/205 (2006.01); H03H 9/60 (2006.01)
CPC H03H 9/542 (2013.01) [H03H 9/205 (2013.01); H03H 9/605 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A hybrid band-pass filter, comprising:
an input terminal for receiving an input signal;
a first acoustic resonance unit coupled to the input terminal, said first acoustic resonance unit including a first series acoustic resonance unit and a first parallel acoustic resonance unit;
a first port matching inductor having a first end coupled to said input terminal and a second end coupled to ground;
a second matching inductor coupled at a first end to the series acoustic resonance unit of the first acoustic resonance unit, and at a second end to a filter;
said filter being coupled to one end of a third matching inductor, another end of the third matching inductor being coupled to a second acoustic resonance unit, said second acoustic resonance unit including two parallel connected acoustic resonators having a series acoustic resonator connected between said parallel connected acoustic resonators;
a second port matching inductor connected at one end to said second acoustic resonance unit and an output terminal of the hybrid band-pass filter, a second end of said second port matching inductor connected to ground;
a matching substrate on which are arranged the first acoustic resonance unit, the filter, and the second acoustic resonance unit; and
a polymer filled shell formed external to and encapsulating the first acoustic resonance unit, the filter, and the second acoustic resonance unit.