发明名称 |
Branching filter having both saw ladder and dual mode filters, and electronic apparatus using the branching filter |
摘要 |
A duplexer includes two surface acoustic wave filter having different band center frequencies, and a phase matching circuit that matches the phases of the two surface acoustic wave filters to each other. In this duplexer, one of the two surface acoustic wave filters is a ladder type surface acoustic wave filter, while the other one of the two surface acoustic wave filters includes two or more dual-mode type surface acoustic wave filters that are connected in parallel.
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申请公布号 |
US7135944(B2) |
申请公布日期 |
2006.11.14 |
申请号 |
US20030474513 |
申请日期 |
2003.10.22 |
申请人 |
FUJITSU LIMITED |
发明人 |
IWAMOTO YASUHIDE;INOUE SHOGO;IKATA OSAMU;TSUTSUMI JUN |
分类号 |
H03H9/72;H03H9/00;H03H9/05;H03H9/10;H03H9/25;H03H9/64 |
主分类号 |
H03H9/72 |
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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