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Antenna-for-a-radio-communication-apparatus

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Antenna for a radio communication apparatus

Details

Inventors: Itoh, Ryoh; Yokoyama, Yukio; Ono, Takao;
Assignee: NEC Corporation (Tokyo, JP)
Primary Examiner: Hajec; Donald
Assistant Examiner: Le; Hoanganh
Attorney, Agent or Firm: Young & Thompson

A miniature and high performance antenna applicable to a radio communication apparatus and made up of a straight antenna rod and an antenna coil or coil element. A first whip antenna has a first portion retractable into the casing of the apparatus and a second portion constantly positioned externally of the casing. A second whip antenna has a coil element in the form of a loading coil having a predetermined number of turns. The second whip antenna is coaxially provided on the upper end of the first whip antenna and slidable relative to and in the axial direction of the first whip antenna. The second portion of the first whip antenna is movable between a position where one end of the coil element is disengaged from one end of the second portion and a position where the former is engaged with the latter. The antenna exhibits a desirable electric characteristic when pulled out of the casing of the apparatus and, in addition, promotes the efficient use of the limited space available in the casing.

DETAILED DESCRIPTION It is, therefore, an object of the present invention to provide an antenna for a radio communication apparatus which exhibits an improved electric characteristic when a straight antenna rod is extended from the casing of the apparatus.
It is another object of the present invention to provide an antenna for a radio communication apparatus which promotes the effective use of a limited space available in the apparatus by reducing the total length when a straight antenna rod is retracted into the casing.
An antenna for a radio communication apparatus of the present invention comprises a first whip antenna having a first portion retractable into the casing of the apparatus and a second portion constantly positioned externally of the casing, and a second whip antenna having a coil element in the form of a loading coil having a predetermined number of turns.
The second whip antenna is coaxially provided on the upper end of the first whip antenna and slidable relative to and in the axial direction of the first whip antenna.
The second portion of the first whip antenna is movable between a position where one end of the coil element is disengaged from one end of the second portion and a position where the former is engaged with the latter.

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