Communications: radio wave antennas – Antennas – With radio cabinet
Patent
1979-04-04
1981-05-26
Lieberman, Eli
Communications: radio wave antennas
Antennas
With radio cabinet
343788, 343895, H01Q 136
Patent
active
042701287
ABSTRACT:
Compact radio antennae are disclosed which comprise an extended conductor, such as a wire, arranged to form an elongated structure. The conductor is arranged in a plurality of windings comprising windings of opposite senses positioned coaxially in proximate relation. In one form the conductor is arranged in a series of helical windings all coaxial, to form a cylindrical structure, and successive windings in the series are alternately left-handed and right-handed. In another form the conductor is arranged in a first helical winding forming a cylindrical structure and a second helical winding of opposite chirality to the first, but with the same number of turns and longitudinal extent and coaxial with it. A flux-concentrating core may be longitudinally disposed within the cylindrical structure. Antennae are particularly described for the HF, VHF and UHF bands.
REFERENCES:
patent: 2153975 (1939-04-01), Smith et al.
patent: 2511611 (1950-06-01), Wheeler
patent: 3774221 (1973-11-01), Francis
patent: 4136344 (1979-01-01), Nakao et al.
Lieberman Eli
National Research Development Corporation
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