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    • 7. 发明公开
    • Window glass antenna system
    • 窗玻璃天线系统
    • EP0807987A2
    • 1997-11-19
    • EP97303266.7
    • 1997-05-14
    • NIPPON SHEET GLASS CO. LTD.
    • Oka, Hidetoshi, c/o Nippon Sheet Glass Co., Ltd.Matsuoka, Yoshinori, Nippon Sheet Glass Co., Ltd.Tanaka, HideakiTakano, Yasuyuki
    • H01Q1/12
    • H01Q1/1278
    • A window glass antenna system includes a defogging heater pattern (2) disposed on a window glass pane (10) and being operable also as an AM broadcast receiver antenna, an impedance matching circuit (20) having two inductors (L1; L2) for respectively causing series resonance and parallel resonance of AM broadcast signals fed from an output (20B) of the heater pattern (2) and being designed to supply the AM broadcast signals to an associated radio receiver, and at least one capacitor (C1; C2) disposed between the heater pattern output (20B) and the impedance matching circuit (20) for blocking induced noises of AM frequency band. With this arrangement, it becomes possible to significantly attenuate noises of AM frequency band to be induced into the heater pattern, without attenuating received signals of AM broadcast, whereby AM broadcast radio reception of good S/N ratio is enabled.
    • 窗玻璃天线系统包括设置在窗玻璃(10)上的除雾加热器图案(2),并且还可操作为AM广播接收器天线,具有分别具有两个电感器(L1; L2)的阻抗匹配电路(20) 引起从加热器模式(2)的输出(20B)馈送的AM广播信号的串联谐振和并联谐振,并且被设计为将AM广播信号提供给相关联的无线电接收器,并且设置至少一个电容器(C1; C2) 在加热器模式输出(20B)和阻抗匹配电路(20)之间,用于阻止AM频带的感应噪声。 由此,不会使AM广播的接收信号衰减,能够使AM频带的噪声大幅衰减成加热器模式,从而能够进行良好的S / N比的AM广播无线接收。