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    • 38. 发明公开
    • Retractable antenna
    • 可伸缩天线
    • EP0516490A3
    • 1993-03-24
    • EP92305825.9
    • 1992-06-24
    • NOKIA MOBILE PHONES (U.K.) LIMITED
    • Baldry, Frank
    • H01Q1/24H04B1/034
    • H01Q1/244
    • An antenna assembly comprises an elongate antenna element (11) mounted in a support (5) and movable between a retracted position (see Figure 2) and an extended position (see Figure 1). A helical antenna element (12) is carried at one end of the elongate element. The support (5) comprises a pair of concentric conductors (9,10) which provide a coaxial feed to the antenna elements (11, 12). Suitably the support (5) comprises a dielectric tube (6) having respective conductive portions (9,10) provided on the inner and outer faces thereof. The elongate antenna element is slidably mounted within the central conductor (9). In the retracted position both ends of the elongate antenna element are electrically connected to the central conductor (9). The elongate antenna element is thus rendered inactive as a radiating element and essentially becomes part of the central coaxial feed coupled directly to the helical antenna element. The invention provides a compact and convenient dual antenna arrangement ideally suited for use in a portable cellular radio telephone.
    • 天线组件包括安装在支撑件(5)中并且可在缩回位置(参见图2)和延伸位置(参见图1)之间移动的细长天线元件(11)。 螺旋天线元件(12)被承载在细长元件的一端。 支架(5)包括一对向天线元件(11,12)提供同轴馈电的同心导体(9,10)。 适当地,支撑件(5)包括电介质管(6),电介质管(6)具有设置在其内表面和外表面上的相应导电部分(9,10)。 细长天线元件可滑动地安装在中心导体(9)内。 在收缩位置,细长天线元件的两端电连接到中心导体(9)。 因此细长天线元件作为辐射元件变得不起作用并且基本上成为直接耦合到螺旋天线元件的中心同轴馈电的一部分。 本发明提供了一种理想地适用于便携式蜂窝无线电话的紧凑和方便的双天线装置。