Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1995-12-18
1998-02-10
Wimer, Michael C.
Communications: radio wave antennas
Antennas
With radio cabinet
343729, 343895, 343900, H01Q 124
Patent
active
057174083
ABSTRACT:
A retractable antenna for use with a cellular telephone wherein the retractable antenna is removably mounted on the upper end of the telephone. The retractable antenna includes an antenna housing which extends upwardly from the upper end of the telephone and which has a matching circuit provided therein. A helical radiator is positioned in the antenna housing and has its lower end operatively connected to the matching circuit. An elongated radiator is selectively vertically movably positioned in the antenna housing and the telephone and is movable between extended and retracted positions with respect to the antenna housing and the telephone housing. The lower end of the elongated radiator is electrically connected to the upper end of the helical radiator when the elongated radiator is in its extended position. The elongated radiator is electrically disconnected from the helical radiator when the elongated radiator is in its retracted position. The matching circuit in the telephone housing is operatively electrically connected to the telephone circuitry so that the antenna serves as a 1/4 wave antenna when the elongated radiator is in its retracted position and so that the antenna serves as a 1/2 wave antenna when the elongated radiator is in its extended position.
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"Lightweight Trap Antennas--Some Thoughts" Jun. 1983, QST, Jun. 1993, p. 15 .
Simmons Kenneth D.
Sullivan Jonathan Lee
Wilcox Glen A.
Centurion International, Inc.
Thomte Dennis L.
Wimer Michael C.
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