发明名称 |
Monolithic multipole filters made of thin film stacked crystal filters |
摘要 |
This invention discloses a monolithic multipole stacked crystal filter comprised of a series of cascaded 2-port semiconductor bulk acoustic resonator stacked crystal filters electrically cascaded and a shunt inductor connected between each of the 2-port filters. Each of the 2-port filters including a first and second piezoelectric layer, typically aluminum nitride. A first input electrode is positioned on a top surface of one of the piezoelectric layers and a second output electrode is positioned on a bottom surface of the other of the piezoelectric layers. A ground electrode is positioned between the piezoelectric layers. In this regard, the piezoelectric layers will resonate at a resonant frequency and provide bandpass filter characteristics. The complete monolithic multipole filter provides control of the passband shape which yields highly desirable filter characteristics.
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申请公布号 |
US5382930(A) |
申请公布日期 |
1995.01.17 |
申请号 |
US19920993575 |
申请日期 |
1992.12.21 |
申请人 |
TRW INC. |
发明人 |
STOKES, ROBERT B.;GARBER, EDWARD M.;CRAWFORD, JAY D.;CUSHMAN, DREW |
分类号 |
H03H3/04;H03H9/56;H03H9/58;(IPC1-7):H03H9/56 |
主分类号 |
H03H3/04 |
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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