Elastic wave device, filter, splitter, and communication device
US-2024339986-A1 · Oct 10, 2024 · US
Antenna duplexer
US8994472B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8994472-B2 |
| Application number | US-201213353350-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 19, 2012 |
| Priority date | Jan 26, 2011 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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- Title
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Abstract
Official abstract text for this publication.
An antenna duplexer includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonance and an auxiliary resonance. Attenuation poles caused by the main resonance and the auxiliary resonance are within the low frequency band. This antenna duplexer has a high attenuation characteristic and a high isolation characteristic while maintaining a low insertion loss.
First claim
Opening claim text (preview).
What is claimed is: 1. An antenna duplexer comprising: an antenna terminal configured to be connected to an antenna; a first terminal configured to be connected to a first external circuit; a second terminal configured to be connected to a second external circuit; a first filter connected in series between the antenna terminal and the first terminal, the first filter having a passband in a low frequency band; and a second filter connected in series between the antenna term…
Assignees
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Classifications
- H03H9/725Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8994472B2 cover?
- An antenna duplexer includes first and second filters connected to an antenna terminal. The first filter has a passband of a low frequency band. The second filter has a passband of a high frequency band. The second filter is a ladder-type filter including series-arm resonators and parallel-arm resonators. At least one parallel-arm resonator out of the parallel-arm resonators has a main resonanc…
- Who is the assignee on this patent?
- Yamaji Toru, Nishimura Kazunori, Fujiwara Joji, and 2 more
- What technology area does this patent fall under?
- Primary CPC classification H03H9/725. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 31 2015 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).