| 发明名称 |
Dielectric ceramic for high frequency, dielectric resonator, dielectric filter, dielectric duplexer and communication unit |
| 摘要 |
A dielectric ceramic for high frequency having a composition represented by the formula: <paragraph lvl="0"><in-line-formula>yCaTiaO1+2a-(1-y)xCa{(MgzZn1-z)1/3Nb2/3}bO1+2b-(1-y)(1-x)Ca(Al1/2Nb1/2)cO1+2c</in-line-formula>wherein (1-y)x<=0.340; 0<x<=0.600; 0.380<=y<=0.570; 0<=z<=1.000; 0.980<=a<=1.050; 0.980<=b<=1.050; and 0.980<=c<=1.050, and comprising a perovskite crystal phase as the main crystal is provided. It has a large specific dielectric constant of from about 40 to 60, a large Q value (at 1 GHz) of about 25,000 or more and a temperature coefficient of resonant frequency which can be controlled within the range of about 0±30 (ppm/° C.). Part of the Nb may be replaced with Ta.
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| 申请公布号 |
US2002025903(A1) |
申请公布日期 |
2002.02.28 |
| 申请号 |
US20010902836 |
申请日期 |
2001.07.11 |
| 申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
ISHIKAWA TATSUYA;TAKAGI HITOSHI |
| 分类号 |
C04B35/00;C04B35/46;C04B35/465;H01B3/12;H01G4/12;H01P1/20;H01P1/213;H01P7/10;(IPC1-7):C04B35/465 |
主分类号 |
C04B35/00 |
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