Parallel hybrid acoustic passive filter

Patent metadata

Field	Value
Publication number	US-12470194-B2
Application number	US-202318368851-A
Country	US
Kind code	B2
Filing date	Sep 15, 2023
Priority date	Jul 18, 2018
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

Aspects of this disclosure relate to a parallel hybrid acoustic passive filter. The parallel hybrid acoustic passive filter includes a first sub-filter and a second sub-filter. The first sub-filter includes a first acoustic resonator and a first non-acoustic passive component. The second sub-filter includes a second acoustic resonator and second first non-acoustic passive component. The first sub-filter and the second sub-filter are together arranged to filter a radio frequency signal. The parallel hybrid acoustic filter can be a band pass filter or a band stop filter, for example. Related multiplexers, wireless communication devices, and methods are disclosed.

First claim

What is claimed is:

1 . A multiplexer with a parallel hybrid acoustic passive filter, the multiplexer comprising:
a first filter configured to filter a radio frequency signal, the first filter including a first sub-filter in parallel with a second sub-filter at an input common node and an output common node, the first sub-filter including at least a first shunt circuit and a second shunt circuit connected in parallel with each other, the first shunt circuit having at least a first shunt passive component with an acoustic resonator, the second shunt circuit having a second shunt passive component without an acoustic resonator, and the second sub-filter including a third shunt circuit and a fourth shunt circuit in parallel with each other, and at least one capacitor in parallel with the third and fourth shunt circuits; a third shunt passive component connected to the input common node and a fourth shunt passive component connected to the output common node; a first series passive component connected in series to the input common node; and a second filter coupled to the first and second common nodes.

2 . The multiplexer of claim 1 wherein the first filter is a band pass filter.

3 . The multiplexer of claim 2 wherein a frequency response of the first filter has a first sub-passband corresponding to the first sub-filter, a second sub-passband corresponding to the second sub-filter, and a notch at a notch frequency between the first sub-passband and a second sub-passband.

4 . The multiplexer of claim 2 wherein the second filter is a band stop filter.

5 . The multiplexer of claim 1 wherein the acoustic resonator is a bulk acoustic wave resonator.

6 . The multiplexer of claim 1 wherein the second sub-filter includes a fifth shunt circuit having an acoustic resonator.

7 . The multiplexer of claim 1 wherein the first filter has a first passband, the second filter has a second passband, the first passband having a lower edge that is at a higher frequency than an upper edge of the second passband.

8 . The multiplexer of claim 1 further comprising a third filter coupled to at least one of the first and second common nodes.

9 . The multiplexer of claim 1 wherein the first sub-filter includes a series acoustic resonator in series with the first shunt circuit.

10 . The multiplexer of claim 1 wherein the second filter is a high pass filter.

11 . A parallel hybrid acoustic passive filter comprising:
a first sub-filter including at least a first shunt circuit and a second shunt circuit connected in parallel with each other, the first shunt circuit having at least a first shunt passive component with an acoustic resonator, the second shunt circuit having a second shunt passive component without an acoustic resonator; a second sub-filter coupled in parallel with the first sub-filter at in input common node and an output common node, the second sub-filter including a third shunt circuit and a fourth shunt circuit in parallel with each other, and at least one capacitor in parallel with the third and fourth shunt circuits; a third shunt passive component connected to the input common node and a fourth shunt passive component connected to the output common node; and a series passive component connected in series to the input common node.

12 . The parallel hybrid acoustic passive filter of claim 11 wherein the first sub-filter and the second sub-filter are together arranged as a band pass filter having a passband.

13 . The parallel hybrid acoustic passive filter of claim 11 wherein a frequency response of the parallel hybrid acoustic passive filter has a first sub-passband corresponding to the first sub-filter, a second sub-passband corresponding to the second sub-filter, and at least one notch at a notch frequency between the first sub-passband and a second sub-passband.

14 . The parallel hybrid acoustic passive filter of claim 11 wherein the first sub-filter and the second sub-filter are together arranged as a band stop filter having a stop band.

15 . The parallel hybrid acoustic passive filter of claim 11 wherein the acoustic resonator is a bulk acoustic wave resonator.

16 . The parallel hybrid acoustic passive filter of claim 11 wherein the first sub-filter includes a series acoustic resonator in series with the first shunt circuit, the series acoustic resonator in parallel with a passive component.

17 . The parallel hybrid acoustic passive filter of claim 11 wherein the first sub-filter further includes a third shunt acoustic resonator.

18 . The parallel hybrid acoustic passive filter of claim 11 wherein the second shunt inductor is part of an integrated passive device.

19 . The parallel hybrid acoustic passive filter of claim 11 wherein the first sub-filter and the second sub-filter have different passbands.

20 . The parallel hybrid acoustic passive filter of claim 11 wherein a lower bound of a passband of the parallel hybrid acoustic passive filter is at least 2 gigahertz.

Assignees

• Skyworks Solutions Inc

Inventors

• Ta Hai H
• Pan Bo
• Sun Weimin

Classifications

• H04B1/0475

  with means for limiting noise, interference or distortion (H04B1/0483 takes precedence) · CPC title

• H03H7/1766

  Parallel LC in series path (H03H7/1783 takes precedence) · CPC title

• H03H7/1758

  Series LC in shunt or branch path (H03H7/1791 takes precedence) · CPC title

• H01Q1/50

  Structural association of antennas with earthing switches, lead-in devices or lightning protectors · CPC title

• H04L5/1461

  Suppression of signals in the return path, i.e. bidirectional control circuits · CPC title