发明名称 |
High-frequency ladder type piezoelectric filter and piezoelectric resonator therefor. |
摘要 |
<p>A ladder type piezoelectric filter of the present invention is made usable in high frequency ranges by employing a piezoelectric resonator having the second harmonic wave mode SM. A series resonator and a parallel resonator of the ladder type piezoelectric filter of the present invention are so arranged that center electrode regions and outer electrode regions are mutually polarized along opposite directions, and the center electrode regions are connected to the outer electrode regions, respectively. <IMAGE></p> |
申请公布号 |
EP0669713(A1) |
申请公布日期 |
1995.08.30 |
申请号 |
EP19950102185 |
申请日期 |
1995.02.16 |
申请人 |
NGK SPARK PLUG CO., LTD |
发明人 |
OGAWA, TATSUO, C/O NGK SPARK PLUG CO., LTD.;NAKAGAWA, YASUHIKO, C/O NGK SPARK PLUG CO., LTD. |
分类号 |
H03H9/02;H03H9/10;H03H9/58;H03H9/60;(IPC1-7):H03H9/58 |
主分类号 |
H03H9/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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