Variable capacitance circuit, variable capacitance thin film capacitor and radio frequency device
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United States of America Patent
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Feb 21, 2006
Grant Date -
Aug 26, 2004
app pub date -
Sep 25, 2003
filing date -
Sep 27, 2002
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Abstract
There is disclosed a variable capacitance circuit which comprises: first to Nth variable capacitance elements C1-CN (N is an odd number) sequentially connected in series between an input terminal I and an output terminal O, whose capacitances change depending on voltage applied thereto; an ith bias line on the input terminal side provided between an input terminal portion of the first variable capacitance element and a connection point between a 2ith variable capacitance element and a (2i+1)th variable capacitance element; and an ith bias line on the output terminal side provided between an output terminal portion of the Nth variable capacitance element and a connection point between a (2i-1)th variable capacitance element and the 2ith variable capacitance element, where N and i are integers satisfying N=2n+1, n≧1, 1≦i≦n. With the arrangement of the variable capacitance circuit, it is possible to provide a variable capacitance thin film capacitor device whose capacitance change ratio is small in a radio frequency region and large in a direct current region can be provided. Furthermore, a radio frequency device utilizing the variable capacitance thin film capacitor device can be provided.
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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- KYOCERA MITA CORPORATION
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Kishino, Tetsuya | Kyoto, JP | 32 | 551 |
Kurioka, Hideharu | Kyoto, JP | 21 | 63 |
Mishima, Tsuneo | Kyoto, JP | 3 | 145 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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