Communications: radio wave antennas – Antennas – With variable reactance for tuning antenna
Patent
1976-01-12
1977-01-25
Lieberman, Eli
Communications: radio wave antennas
Antennas
With variable reactance for tuning antenna
343803, 343807, 343845, H01Q 926
Patent
active
040054306
ABSTRACT:
A thick folded dipole having an operating frequency which is far less than he first resonance frequency. The dipole includes a folded strand and a thick fed strand having a diameter which is about ten times greater than the diameter of the folded strand. The fed strand comprises two spaced apart cylindrical half strands having ends in the form of conical frustums and coaxial bore holes. A center conductor of a coaxial cable extends through the folded strand, the bore hole of one half strand, the space between the half strands and into the bore hole of the other half strand. Symmetrical spaced apart short circuits for matching the radiation impedance of the dipole by varying the distance between the short circuits are provided between the fed strand and the folded strand. In another embodiment there is disclosed a thick folded half dipole including a folded half strand and a thick fed cylindrical half strand.
REFERENCES:
patent: 2994876 (1961-08-01), Josephson
Dubost Gerard
Havot Henri Albert
Etat Francais represente par le Delegue Ministeriel pour l'Armem
Lieberman Eli
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