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    • 12. 发明授权
    • Antenna device and portable radio set
    • 天线设备和便携式无线电设备
    • US06362793B1
    • 2002-03-26
    • US09633764
    • 2000-08-07
    • Masatoshi SawamuraYoshiki KanayamaYuichiro Saito
    • Masatoshi SawamuraYoshiki KanayamaYuichiro Saito
    • H01Q124
    • H01Q21/28H01Q1/243H01Q1/244H01Q1/362H01Q9/30H04B7/04
    • An antenna in which first and second antenna elements are selected by a switching apparatus so that the first and the second antenna elements are connected to an unbalanced transmission line via a balancing-unbalancing transmission line or only the first antenna element is connected to the unbalanced transmission line. The unbalanced transmission line supplies power via a balanced-to-unbalanced transformation apparatus to the first and the second antenna elements, so as to operate as an antenna, at which time, balanced-to-unbalanced transformation action of the balanced-to-unbalanced transformation apparatus prevents leakage current from flowing from the first or the second antenna element to the unbalanced transmission line and prevents a ground element on which the unbalanced transmission line is grounded from operating as an antenna. This reduces deterioration of antenna characteristics in the vicinity of a human body, so that an antenna device and portable radio set which can sizably reduce deterioration of communication quality can be realized.
    • 一种天线,其中第一和第二天线元件由开关装置选择,使得第一和第二天线元件经由平衡不平衡传输线连接到不平衡传输线,或者仅将第一天线元件连接到不平衡传输 线。 不平衡传输线通过平衡不平衡变换装置向第一和第二天线元件供电,以便作为天线工作,此时平衡不均衡的平衡不平衡变换动作 变换装置防止漏电流从第一或第二天线元件流向不平衡传输线,并且防止不平衡传输线接地的接地元件作为天线工作。 由此,能够降低人体附近的天线特性的劣化,能够实现可以显着降低通信质量恶化的天线装置和便携式无线电装置。