发明名称 |
Filter device for transmitter-receiver antenna |
摘要 |
A filter device for a transmitter-receiver antenna includes a transmission side filter having resonators and a reception side filter having resonators. Each of the transmission side resonators has a first characteristic impedance ratio other than one. On the other hand, each of the reception side resonators has a second characteristic impedance ratio being set to a value which prevents spurious resonance of the reception side filter at an integral multiple of a fundamental resonance frequency of the transmission side filter, so as to avoid the situation where spurious components increase at the above-noted integral multiple in a frequency characteristic of the transmission side filter being affected by a frequency characteristic of the reception side filter.
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申请公布号 |
US5374906(A) |
申请公布日期 |
1994.12.20 |
申请号 |
US19930097185 |
申请日期 |
1993.07.27 |
申请人 |
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. |
发明人 |
NOGUCHI, TOSHIHARU;KIYOSUE, KUNIAKI;YONEDA, TAKEHIKO |
分类号 |
H01P1/205;H01P1/212;H01P1/213;H01P7/04;(IPC1-7):H01P1/213 |
主分类号 |
H01P1/205 |
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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