Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1992-06-09
1993-10-12
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343897, 343900, H01Q 922, H01Q 138, H01Q 500
Patent
active
052529843
ABSTRACT:
An elongated rod 11 of dielectric material, for example fiberglass--plastic or the like, has a central conductor (12) located coaxially therein, the conductor having a length L=3/2 .lambda.; in the central .lambda./2 range, the insulating rod is surrounded by a conductive layer (13, 16, 20, 25), for example of conductive lacquer, a mesh or braid of conductive material, a conductive foil or tube or the like. In the lower .lambda./2 region of L1, the bottom terminal of the central conductor will provide a high resistance output for the higher one of the frequency ranges which, for example, can be a radio telephone, or vehicular communication frequency of between 450-470 MHz. The entire antenna is suitable as an AM-FM/radio-telephone combination antenna. .lambda. is the median operating wave length of the higher one of the frequency ranges for which the antenna is suitable. Preferably, the antenna is covered with a sleeve of insulating material, for example a heat shrinkable plastic (27). The band width of the antenna can be extended by placing a further electrically conductive layer (513, 619, 722, 828) on the rod, spaced by a gap (a) physically and electrically from the conductive layer (13, 16, 20, 25) in the middle of the elongated rod. The further conductive layer is .lambda./2 long, and connected to the inner coaxial conductor (12, 512), which in turn can be coupled to an antenna input, for example the center conductor of a coaxial cable of a radio apparatus.
REFERENCES:
patent: 2158376 (1939-05-01), Moser et al.
patent: 3031668 (1962-04-01), Bryson
patent: 3789418 (1974-01-01), Reiber et al.
patent: 4435713 (1984-03-01), Gasparaitis et al.
patent: 4748450 (1988-05-01), Hines et al.
Dorrie Horst
Militz Uwe
Wilken Heinrich
Robert & Bosch GmbH
Wimer Michael C.
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