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    • 3. 发明授权
    • Matching circuit and antenna apparatus
    • 匹配电路和天线装置
    • US5874926A
    • 1999-02-23
    • US815277
    • 1997-03-10
    • Teruhisa TsuruHarufumi MandaiToshifumi OidaYoichiro Suga
    • Teruhisa TsuruHarufumi MandaiToshifumi OidaYoichiro Suga
    • H01Q1/36H01Q1/38H01Q1/50
    • H04B1/18H01Q1/362H01Q1/38H03H7/40
    • A matching circuit and an antenna apparatus which, though small-sized, can be used in a radio apparatus which transmits and receives radio waves having a wide range of frequencies. A matching circuit includes an inductance element formed of a chip inductor connected in series with an antenna body, a first capacitance element formed of a trimmer capacitor, and a second capacitance element formed of a chip capacitor, which capacitance elements are connected between respective ends of the inductance element and a ground terminal, and thus in parallel to the antenna body. One end of the inductance element is connected to the power supply terminal of the antenna body, and the other end is connected to a power source for applying a voltage to the antenna body. The first capacitance element is connected between a ground and the connection point of the power supply terminal of the antenna body and the inductance element. The second capacitance element is connected between a ground and the connection point of the inductance element and the power source.
    • 尽管体积小的匹配电路和天线装置可以用于发送和接收具有宽频率范围的无线电波的无线电装置中。 匹配电路包括由与天线体串联连接的芯片电感器形成的电感元件,由微调电容器形成的第一电容元件和由片状电容器形成的第二电容元件,所述电容元件连接在 电感元件和接地端子,因此平行于天线体。 电感元件的一端连接到天线体的电源端子,另一端连接到用于向天线体施加电压的电源。 第一电容元件连接在地与天线体的电源端子与电感元件的连接点之间。 第二电容元件连接在接地和电感元件与电源的连接点之间。