Multiplexer
US-2020412335-A1 · Dec 31, 2020 · US
Bandpass filter with improved upper band edge sharpness
US11329626B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11329626-B2 |
| Application number | US-201916698406-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 27, 2019 |
| Priority date | Nov 30, 2018 |
| Publication date | May 10, 2022 |
| Grant date | May 10, 2022 |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
Bandpass filters are disclosed. A bandpass filter includes a plurality of series resonators and a plurality of shunt resonators. The series resonators are connected in series between a first port and a second port. The plurality of series resonators includes a first series resonator and a second series resonator connected at a node. The plurality of shunt resonators includes a first shunt resonator coupled between the node and a ground. A capacitor bridges the first and second series resonators.
First claim
Opening claim text (preview).
It is claimed: 1. A bandpass filter comprising: a plurality of series resonators connected in series between a first port and a second port, the plurality of series resonators including a first series resonator and a second series resonator connected at a node; a plurality of shunt resonators including a first shunt resonator coupled between the node and a ground; a second capacitor connected in series with the first shunt resonator; and a capacitor bridging the first and second series resonators, wherein a resonance frequency of the first shunt resonator, in isolation, is lower than an upper limit of a passband of the bandpass filter, and wherein a capacitance of the second capacitor is configured such that a series combination of the first shunt resonator and the second capacitor has a resonance frequency greater than the upper limit of the passband. 2. The bandpass filter of claim 1 , wherein the first and second series resonators are electrically identical. 3. The bandpass filter of claim 1 , wherein a resonance frequency of the first shunt resonator is greater than a resonance frequency of the first and second series resonators. 4. The bandpass filter of claim 3 , wherein the resonance frequency of the first shunt resonator is proximate the upper limit of the passband. 5. The bandpass filter of claim 1 , wherein the plurality of series resonators includes at least a third series resonator, and the plurality of shunt resonators includes at least three shunt resonators. 6. A bandpass filter comprising: a plurality of series resonators connected in series between a first port and a second port, the plurality of series resonators including a first series resonator and a second series resonator connected at a node; a capacitor bridging the first and second series resonators; and a series combination of a first shunt resonator and second capacitor coupled between the node and a ground, wherein a resonance frequency of the first shunt resonator, in isolation, is lower than an upper limit of the passband, and a capacitance of the second capacitor is configured such that a series combination of the first shunt resonator and the second capacitor has a resonance frequency greater than the upper limit of the passband. 7. The bandpass filter of claim 6 , wherein the plurality of series resonators includes at least a third series resonator. 8. The bandpass filter of claim 6 , further comprising: at least a second shunt resonator.
Assignees
Inventors
Classifications
- H03H9/542Primary
including passive elements (H03H9/545 takes precedence) · CPC title
consisting of a ladder configuration · CPC title
consisting of a ladder configuration · CPC title
Ladder SAW filters · CPC title
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Frequently asked questions
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- What does patent US11329626B2 cover?
- Bandpass filters are disclosed. A bandpass filter includes a plurality of series resonators and a plurality of shunt resonators. The series resonators are connected in series between a first port and a second port. The plurality of series resonators includes a first series resonator and a second series resonator connected at a node. The plurality of shunt resonators includes a first shunt reson…
- Who is the assignee on this patent?
- Resonant Inc
- What technology area does this patent fall under?
- Primary CPC classification H03H9/542. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue May 10 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).