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    • 9. 发明授权
    • Filter device for transmitter-receiver antenna
    • 发射机 - 接收机天线滤波器
    • US5374906A
    • 1994-12-20
    • US97185
    • 1993-07-27
    • Toshiharu NoguchiKuniaki KiyosueTakehiko Yoneda
    • Toshiharu NoguchiKuniaki KiyosueTakehiko Yoneda
    • H01P1/205H01P1/212H01P1/213H01P7/04
    • H01P1/2136
    • 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.
    • 用于发射机 - 接收机天线的滤波器装置包括具有谐振器的发射侧滤波器和具有谐振器的接收侧滤波器。 每个发送侧谐振器具有除了一个之外的第一特性阻抗比。 另一方面,每个接收侧谐振器的第二特性阻抗比被设定为防止接收侧滤波器的杂散谐振为发送侧滤波器的基本共振频率的整数倍的值,以避免 发送侧滤波器的频率特性中的杂散分量以上述积分倍数增加的情况受到接收侧滤波器的频率特性的影响。