Reactance Filter Comprising Acoustic Waves Resonators
US-2015365069-A1 · Dec 17, 2015 · US
Branching filter
US10193527B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10193527-B2 |
| Application number | US-201615355445-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 18, 2016 |
| Priority date | Dec 17, 2015 |
| Publication date | Jan 29, 2019 |
| Grant date | Jan 29, 2019 |
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Abstract
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A branching filter includes a low-pass filter provided between a common port and a first signal port, and a high-pass filter provided between the common port and a second signal port. The low-pass filter includes: a first LC resonant circuit; and a first acoustic wave resonator provided in a shunt circuit connecting a path leading from the first LC resonant circuit to the first signal port to a ground. The high-pass filter includes: a second LC resonant circuit; and a second acoustic wave resonator provided in a path leading from the second LC resonant circuit to the second signal port.
First claim
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What is claimed is: 1. A branching filter comprising: a common port; a first signal port; a second signal port; a low-pass filter provided between the common port and the first signal port, and configured to selectively pass a signal of a frequency within a first passband not higher than a first cut-off frequency, the low-pass filter including: a first LC resonant circuit; and a first acoustic wave resonator provided in a shunt circuit connecting a path leading from the first LC resonant circuit to the first signal port to a ground, the first acoustic wave resonator having a resonant frequency higher than the first cut-off frequency; and a high-pass filter provided between the common port and the second signal port, and configured to selectively pass a signal of a frequency within a second passband not lower than a second cut-off frequency higher than the first cut-off frequency. 2. The branching filter according to claim 1 , wherein the first LC resonant circuit is an LC parallel resonant circuit including a first inductor and a first capacitor provided in parallel between the common port and the first signal port. 3. The branching filter according to claim 1 , wherein the first acoustic wave resonator has an anti-resonant frequency higher than the second cut-off frequency. 4. The branching filter according to claim 1 , wherein the first LC resonant circuit has a resonant frequency higher than the resonant frequency of the first acoustic wave resonator. 5. A branching filter comprising: a common port; a first signal port; a second signal port; a low-pass filter provided between the common port and the first signal port, and configured to selectively pass a signal of a frequency within a first passband not higher than a first cut-off frequency; and a high-pass filter provided between the common port and the second signal port, and configured to selectively pass a signal of a frequency within a second passband not lower than a second cut-off frequency higher than the first cut-off frequency, the high-pass filter including: a second LC resonant circuit; and a second acoustic wave resonator provided in a path leading from the second LC resonant circuit to the second signal port, the second acoustic wave resonator having an anti-resonant frequency lower than the second cut-off frequency. 6. The branching filter according to claim 5 , wherein the second LC resonant circuit is an LC series resonant circuit including a second inductor and a second capacitor provided in series between a path leading from the common port to the second acoustic wave resonator and a ground. 7. The branching filter according to claim 5 , wherein the second acoustic wave resonator has a resonant frequency lower than the first cut-off frequency. 8. The branching filter according to claim 5 , wherein the second LC resonant circuit has a resonant frequency lower than the anti-resonant frequency of the second acoustic wave resonator. 9. A branching filter comprising: a common port; a first signal port; a second signal port; a low-pass filter provided between the common port and the first signal port, and configured to selectively pass a signal of a frequency within a first passband not higher than a first cut-off frequency, the low-pass filter including: a first LC resonant circuit; and a first acoustic wave resonator provided in a shunt circuit connecting a path leading from the first LC resonant circuit to the first signal port to a ground, the first acoustic wave resonator having a resonant frequency higher than the first cut-off frequency; and a high-pass filter provided between the common port and the second signal port, and configured to selectively pass a signal of a frequency within a second passband not lower than a second cut-off frequency higher than the first cut-off frequency, the high-pass filter including: a second LC resonant circuit; and a second acoustic wave resonator provided in a path leading from the second LC resonant circuit to the second signal port, the second acoustic wave resonator having an anti-resonant frequency lower than the second cut-off frequency. 10. The branching filter according to claim 9 , wherein the first LC resonant circuit is an LC parallel resonant circuit including a first inductor and a first capacitor provided in parallel between the common port and the first signal port, and the second LC resonant circuit is an LC series resonant circuit including a second inductor and a second capacitor provided in series between a path leading from the common port to the second acoustic wave resonator and the ground. 11. The branching filter according to claim 9 , wherein the first acoustic wave resonator has an anti-resonant frequency higher than the second cut-off frequency, and the second acoustic wave resonator has a resonant frequency lower than the first cut-off frequency. 12. The branching filter according to claim 9 , wherein the first LC resonant circuit has a resonant frequency higher than the resonant frequency of the first acoustic wave resonator, and the second LC resonant circuit has a resonant frequency lower than the anti-resonant frequency of the second acoustic wave resonator.
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Frequently asked questions
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- What does patent US10193527B2 cover?
- A branching filter includes a low-pass filter provided between a common port and a first signal port, and a high-pass filter provided between the common port and a second signal port. The low-pass filter includes: a first LC resonant circuit; and a first acoustic wave resonator provided in a shunt circuit connecting a path leading from the first LC resonant circuit to the first signal port to a…
- Who is the assignee on this patent?
- Tdk Corp
- 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 Jan 29 2019 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).