发明名称 |
Dielectric filter, dielectric duplexer, and communication apparatus |
摘要 |
A dielectric filter including: a lambda/2 resonator for generating resonance of ½-wavelength at a predetermined frequency, having both ends open-circuited or short-circuited; and a pair lambda/4 resonators respectively for generating resonance of ¼-wavelength at a frequency substantially equal to the predetermined frequency, each having one end open-circuited and the other end short-circuited; wherein the pair of lambda/4 resonators are disposed in proximity to each of both ends from the vicinity of the center of the lambda/2 resonator; a terminal coupling to the lambda/2 resonator is provided as an unbalanced terminal; and terminals coupling to the pair of lambda/4 resonators is used as a balanced terminal. In the above filter, the balanced-type input/output of signals can be performed without using a balun.
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申请公布号 |
US6801101(B2) |
申请公布日期 |
2004.10.05 |
申请号 |
US20030339227 |
申请日期 |
2003.01.09 |
申请人 |
MURATA MANUFACTURING CO., LTD. |
发明人 |
HIROSHIMA MOTOHARU;NISHIJIMA SHOHACHI;KATO HIDEYUKI |
分类号 |
H01P1/203;H01P1/205;H01P1/213;H01P5/10;(IPC1-7):H01P1/203;H01P1/20 |
主分类号 |
H01P1/203 |
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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