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    • 2. 发明公开
    • Electronic filter
    • Elektronisches过滤器
    • EP1235347A3
    • 2003-09-17
    • EP02004549.8
    • 2002-02-27
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • Kushitani, HiroshiMizuno, Masayuki
    • H03H7/09
    • H03H7/09
    • Here disclosed is a parallel-resonance type band-pass filter, which is employed for mobile communications equipment such as a mobile phone. According to the filter, each resonator has a single capacitor and serially connected plural inductors both of which are formed on the surface or on an inner layer of a substrate. Electromagnetic coupling between the resonators is established through electromagnetic coupling between at least a pair of inductors - the inductors of the pair belong to respective resonators. The input and the output terminals are coupled with the respective resonators via the capacitor having a properly determined capacitance. With such a simple structure, the filter also can work as an impedance transformer, with the result that the mobile communications equipment will be much smaller.
    • 这里公开了一种并行谐振型带通滤波器,其用于移动通信设备,例如移动电话。 根据滤波器,每个谐振器具有单个电容器并且串联连接多个电感器,它们都形成在基板的表面上或内层上。 通过至少一对电感器之间的电磁耦合建立谐振器之间的电磁耦合 - 该对电感器属于相应的谐振器。 输入端子和输出端子通过具有适当确定的电容的电容器与相应的谐振器耦合。 通过这样一个简单的结构,滤波器也可以作为阻抗变压器工作,结果是移动通信设备将会小得多。