Communications: radio wave antennas – Antennas – Active sleeve surrounds feed line
Patent
1984-06-27
1986-09-09
Lieberman, Eli
Communications: radio wave antennas
Antennas
Active sleeve surrounds feed line
343834, 343826, H01Q 932, H01Q 501
Patent
active
046112146
ABSTRACT:
A vertically polarized array comprised of both bottom fed and top fed conurations having a driven element comprising at least one but, when desirable, two generally horizontal wire conductor segments of a length substantially equal to one half the operating wavelength of the array and with the ends of the half-wave conductor segments being connected to or extending into generally vertical quarter wavelength wire conductor segments. In a bottom fed configuration the feedpoint is at the bottom end of one vertical quarter wavelength conductor segment while in a top fed configuration one vertical quarter wavelength segment comprises a quarter wavelength of coaxial transmission line having one end configured into signal isolation means, comprising a cable choke, while the feedpoint is located at the other end. Behind the array, located at a distance of substantially a quarter wavelength, is a parasitic reflector element comprising a substantially identical structure as the driven element with the lower ends of the vertical quarter wavelength elements thereof positioned a foot or two above the surface of the ground. Such an arrangement provides unidirectional radiation and reception at low take-off angles, e.g. 20.degree. above the horizon.
REFERENCES:
patent: 3576578 (1971-04-01), Harper
patent: 3961331 (1976-06-01), Campbell
"The Half Square Antenna", B. Vester, QST, Mar., 1974, pp. 11-14.
Campbell Donn V.
Dubowicz Palemon W.
Schwering Felix
Goldberg Edward
Lane Anthony T.
Lieberman Eli
Murray Jeremiah G.
The United States of America as represented by the Secretary of
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