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Impedance conversion circuit and communication terminal apparatus
US9106313B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9106313-B2 |
| Application number | US-201314072817-A |
| Country | US |
| Kind code | B2 |
| Filing date | Nov 6, 2013 |
| Priority date | May 9, 2011 |
| Publication date | Aug 11, 2015 |
| Grant date | Aug 11, 2015 |
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Abstract
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In an impedance conversion circuit, since, in a low band, an absolute value of impedance of a primary side coil is smaller than an absolute value of impedance of a capacitor, a high-frequency signal in a low band propagates through a transformer. Thus, impedance matching of a high-frequency signal in a low band is performed by the transformer. Since, in a high band, the absolute value of the impedance of the capacitor is smaller than the absolute value of the impedance of the primary side coil, a high-frequency signal in a high band propagates through the capacitor. Thus, impedance matching of a high-frequency signal in a high band is performed in the capacitor. Accordingly, impedance matching between a high frequency circuit and an antenna element is performed in a wide frequency band.
First claim
Opening claim text (preview).
What is claimed is: 1. An impedance conversion circuit for use in an antenna device that transmits and receives a high-frequency signal in a frequency band including a first frequency band and a second frequency band of which the second frequency band is higher than the first frequency band, the impedance conversion circuit comprising: a transformer that includes a primary side coil and a secondary side coil and is connected between a feeding port and an antenna port; and a firs…
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Electricity · mapped topic
Electricity · mapped topic
- H03H7/38Primary
Electricity · mapped topic
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US9106313B2 cover?
- In an impedance conversion circuit, since, in a low band, an absolute value of impedance of a primary side coil is smaller than an absolute value of impedance of a capacitor, a high-frequency signal in a low band propagates through a transformer. Thus, impedance matching of a high-frequency signal in a low band is performed by the transformer. Since, in a high band, the absolute value of the im…
- Who is the assignee on this patent?
- Murata Manufacturing Co
- What technology area does this patent fall under?
- Primary CPC classification H03H7/38. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Aug 11 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).