Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1995-04-21
1997-01-14
Hajec, Donald T.
Communications: radio wave antennas
Antennas
With radio cabinet
343895, 343900, H01Q 124
Patent
active
055944574
ABSTRACT:
A retractable antenna for use with portable communication equipment comprising two electrically independent electromagnetic radiators in a single package with two modes of operation, retracted and extended. When the antenna is in its retracted position, a short normal-mode monofilar helical radiator is functional. When the antenna is in its extended position, a thin linear radiating element is functional. A switch is provided which connects the internal circuitry of the device to the linear radiating element when the antenna is in its extended position and which connects the internal circuitry of the device to the helical radiator when the antenna is in its retracted position. In each of the extended and retracted positions, the linear radiator and the helical radiator are isolated from one another. A modified form of the antenna is also disclosed.
REFERENCES:
patent: 4205319 (1980-05-01), Gasparaitis et al.
patent: 4760401 (1988-07-01), Imazeki
patent: 4849767 (1989-07-01), Naitou
patent: 4867698 (1989-09-01), Griffiths
patent: 5204687 (1993-04-01), Elliott et al.
patent: 5300940 (1994-04-01), Simmons
patent: 5317325 (1994-05-01), Bottomley
patent: 5353036 (1994-10-01), Baldry
patent: 5446469 (1995-08-01), Makino
patent: 5467096 (1995-11-01), Takamoro et al.
patent: 5469177 (1995-11-01), Rush et al.
patent: 5479178 (1995-12-01), Ha
Doug Demaw "Lightweight Trap Antennas--Some Thoughts" Jun. 1983.
Centurion International, Inc.
Hajec Donald T.
Ho Tan
Thomte Dennis L.
LandOfFree
Retractable antenna does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Retractable antenna, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Retractable antenna will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1391579