Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1986-03-03
1988-02-16
Sikes, William L.
Communications: radio wave antennas
Antennas
With radio cabinet
343895, H01Q 124, H01Q 136
Patent
active
047258454
ABSTRACT:
A retractable antenna assembly is disclosed for tuning an antenna having a helical section to frequency by selectively positioning an appropriate tuning core within the helix. The antenna frequency can either be raised or lowered through the use of conductive or permeable tuning core compositions. The core positioning mechanism is implemented by affixing the tuning core to a portion of the antenna supporting rod slideably located within the helix. This helical antenna/tuning core configuration is readily adaptable to miniature portable radios by providing a helical antenna assembly which is retractable within the radio housing in the receive-only or standby mode, and which is outwardly extendible from the radio housing for use in the active transmit/receive mode. A unique barrel-cam latching mechanism is also described.
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DeMaw, M. F., "Ferromagnetic-Core Design and Application Handbook", 1981, pp. 219-221 and 54.
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Pettengill et al., "Receiving Antenna Design for Miniature Receivers", 1977.
Boehm Douglas A.
Motorola Inc.
Sikes William L.
Southard Donald B.
Warren Charles L.
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