Retractable antenna with shifting electrical length

Details Retractable antenna with shifting electrical length Retractable antenna with shifting electrical length

1998-03-23

1999-12-07

Wong, Don

Communications: radio wave antennas

Antennas

With radio cabinet

343900, H01Q 124

Patent

active

05999133&

ABSTRACT:
An antenna for small mobile devices comprises an antenna rod retractable in an antenna cover, the rod having an extended position, when the device operates in an active mode, or a retracted position, when the device operates in a passive mode. The electrical length of the antenna is different in the respective modes. Further, the antenna rod comprises an upper section and a lower section, separated from each other by an intermediate electrically insulating portion, wherein the upper section forms an antenna in a passive mode and the two sections in the active mode.

REFERENCES:
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5661496 (1997-08-01), Baek et al.
patent: 5794158 (1998-08-01), Itoh
patent: 5801662 (1998-09-01), Itoh
patent: 5835065 (1998-11-01), Wallace et al.

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