发明名称 |
Balanced-type surface acoustic wave lattice filter |
摘要 |
A balanced-type surface acoustic wave filter is provided which can attain a balanced-type of high frequency circuit without connecting a balance-unbalanced conversion circuit. A substrate of tantalic acid lithium substrate with 36 degrees rotation, Y cut, and X propagation is used, and aluminium is used for electrode to form resonators. Then, two resonators in a serial arm and two resonators in a parallel arm are connected in the form of symmetry and lattice to form a balanced-type surface acoustic wave filter. In this configuration, antiresonance frequency in the serial arms and resonance frequency in the parallel arms are substantially equal to each other.
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申请公布号 |
US5847626(A) |
申请公布日期 |
1998.12.08 |
申请号 |
US19960655049 |
申请日期 |
1996.05.29 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
TAGUCHI, YUTAKA;EDA, KAZUO;SEKI, SHUN-ICHI;ONISHI, KEIJI |
分类号 |
H03H9/00;H03H9/64;(IPC1-7):H03H9/64;H03H9/52 |
主分类号 |
H03H9/00 |
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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