| 摘要 |
A preferably vertically oriented dipole antenna structure comprises a downwardly extending coaxial cable-like connector at the bottom of the structure attached to and insulated from a dipole element-forming sleeve whose upper end is rigidly connected to an insulating housing. The upper end of the housing supports a dipole element-forming rod extending vertically upwardly therefrom. The coaxial cable-type connector includes an outer rotatable conductive sleeve extending coaxially of the dipole element-forming sleeve and a central downwardly extending plug-in pin, the sleeve and the plug-in pin being coupled and connected to a cable extending through the dipole element-forming sleeve to a point within the insulating housing where a pair of cable conductors make connection to inductive coupling means for coupling signals between said conductors and the inner ends of the dipole element-forming sleeve and rod.
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