Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1980-07-07
1982-09-28
Lieberman, Eli
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343885, H01Q 152, H01Q 918
Patent
active
043521096
ABSTRACT:
An end supported antenna having inner and outer elements extending outwardly from a supported end and of which the inner and outer elements each form one element of the dipole. Such antennas are driven centrally of the inner and outer ends or intermediate the ends between the dipoles. There is a decoupling sleeve on the inner element that functions as a coaxial transmission line of variable characteristic impedance on its inside and functions as a radiating element of the antenna on its outside. Generally, one or two sleeves are employed, the sleeves being of non-uniform cross section so as to be either conical or generally conical in shape, flaring from the supported end. A dielectric member separates the inner and outer elements and has an impedance matching network formed therewith. A support pipe extends outwardly from its supporting end to adjacent the impedance matching network. Coaxial conductors extend into the support pipe and the center coaxial conductor is connected to the outer element and the outer coaxial conductor is connected to the support pipe and to the decoupling sleeve or sleeves. Each sleeve may be secured to the support pipe by a single band clamp. The sleeves have resonant length greater than 1/4 wavelength such as in the range of between 0.33 and 0.433 wavelength.
REFERENCES:
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Reynolds, Facts About Proper VHF Vertical Antenna Design, Published 1979 by Advanced Electronic Applications, Inc., Lynnwood, Wash.
Reynolds Donald K.
Smithmeyer Louis P. C.
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