Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1975-07-08
1977-03-29
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343803, 343807, H01Q 926
Patent
active
040152650
ABSTRACT:
A thick folded doublet antenna, the diameter of the current-receiving wire of which is on the order of ten times greater than that of the folded wire, the current-receiving wire comprising two half-wires of exterior symmetrical cylindrical form terminating at the center in two opposed frusto-conical portions, the small bases of which are close to each other, a coaxial conductor having an impedance of approximately 50 ohms extending axially through one of the half-wires, characterized in that the central conductor of the coaxial line is extended across the space between the bases of the frusto-conical portions and penetrates coaxially into a bore in the other half-wire, the central conductor being insulated from the other half-wire, the length of penetration of the central conductor being very short, and the coaxial line being supplied with signals at frequencies whose wavelengths are approximately six times the total height of said doublet antenna.
REFERENCES:
patent: 2617028 (1952-11-01), Stolk
patent: 3074064 (1963-01-01), Pickles
Dubost Gerard
Havot Henri Albert Paul
Etat Francais
Lieberman Eli
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