Patent ID: 9742451
Date: 2017-08-22
CPC Classifications: H03H,H04B

Claim:
1. A multiplexer device, comprising: first acoustic band pass filter connected between a first network node and a common antenna port, the first acoustic band pass filter having a first passband and comprising a plurality of first acoustic resonators; a second acoustic band pass filter connected between a second network node and the common antenna port, the second acoustic band pass filter having a second passband and comprising a plurality of second acoustic resonators; and a hybrid LC/acoustic filter connected between a third network node and the common antenna port, the hybrid LC/acoustic filter including a first set of acoustic resonators comprising at least one first acoustic resonator configured to provide a first stopband corresponding to the first passband, and a second set of acoustic resonators comprising at least one second acoustic resonator configured to provide a second stopband corresponding to the second passband, the hybrid LC/acoustic filter comprising an LC filter circuit having at least one capacitor replaced by each of the at least one first acoustic resonator and the at least one second acoustic resonator, respectively, wherein the hybrid LC/acoustic filter has a predetermined frequency range for passing radio frequency (RF) signals, except for frequencies corresponding to the first and second stopbands, which are entirely within the predetermined frequency range for passing the RF signals.