US 11,990,893 B2
Electroacoustic filter with low phase delay for multiplexed signals
Marc Esquius Morote, Munich (DE)
Assigned to RF360 Singapore Pte. Ltd., Singapore (SG)
Filed by RF360 SINGAPORE PTE. LTD., Singapore (SG)
Filed on Feb. 2, 2021, as Appl. No. 17/165,793.
Prior Publication US 2022/0247385 A1, Aug. 4, 2022
Int. Cl. H03H 9/64 (2006.01); H03H 9/25 (2006.01); H03H 9/72 (2006.01)
CPC H03H 9/6406 (2013.01) [H03H 9/25 (2013.01); H03H 9/72 (2013.01)] 25 Claims
OG exemplary drawing
 
1. A wireless communication apparatus comprising:
a first filter comprising:
an acoustic resonator having a first resonator side and a second resonator side, the first resonator side coupled to a first signal connection port;
a first capacitor including a first side coupled to the first resonator side and the first signal connection port, the first capacitor further including a second side coupled to a ground connection port;
a second capacitor including a first side coupled to the ground connection port, the second capacitor further including a second side, wherein the second resonator side and the second side of the second capacitor are coupled to an output port;
a first inductor coupled between the ground connection port and a ground element; and
a second inductor coupled to the output port;
wherein the first filter has an out-of-band frequency range from 3.3 gigahertz (GHz) to 5 GHz with a reflection parameter for the out-of-band frequency range being within a threshold tolerance of an open condition;
a second filter having a second filter antenna side connected to an antenna side of the first filter and a second filter passband range from approximately 3.3 GHz to 4.2 GHz; and
a third filter having a third filter antenna side connected to the antenna side of the first filter and a third filter passband range from approximately 4.4 GHz to 5.0 GHz.