发明名称 |
Antenna duplexer with divided and grounded transmission line |
摘要 |
An antenna duplexer has a first filter and a second filter coupled to respective signal terminals and to a common node. The common node is coupled to an antenna terminal. The first filter has a higher-frequency passband than the second filter. A transmission-line circuit, inserted between the first filter and the common node, increases the impedance of the first filter in its lower stopband. The transmission-line circuit includes an internal node, a first transmission line coupling the internal node to the common node, a second transmission line coupling the internal node to the first filter, and a grounding circuit such as a capacitor coupling the internal node to ground. The grounding circuit further enhances the lower stopband impedance of the first filter.
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申请公布号 |
US6489861(B2) |
申请公布日期 |
2002.12.03 |
申请号 |
US20010842106 |
申请日期 |
2001.04.26 |
申请人 |
OKI ELECTRIC INDUSTRY CO., LTD. |
发明人 |
NOGUCHI KAZUSHIGE;TERADA SATOSHI;FUJITA YOSHIAKI;KOMAZAKI TOMOKAZU;MASHIMO AKIRA |
分类号 |
H03H7/46;H03H7/38;H03H9/25;H03H9/64;H03H9/72;H04B1/50;(IPC1-7):H03H9/72 |
主分类号 |
H03H7/46 |
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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