Helix-loaded spiral antenna

Details Helix-loaded spiral antenna Helix-loaded spiral antenna

1975-10-20

1977-03-15

Dixon, Harold A.

Communications: radio wave antennas

Antennas

Spiral or helical type

H01Q 136

Patent

active

040127443

ABSTRACT:
A circularly polarized, broad-beamed antenna system capable of effectively covering the entire bandwidth of from about 0.5 GHz to about 18 GHz or higher. The system provided comprises a generally conventional planar spiral antenna modified by having the outer ends of its arms terminated by a bifilar helix. The bifilar helix is positioned behind the planar spiral and at 90.degree. to it. By proper coupling of the two antenna portions, it has been found that within the 2 to 18 GHz range, the planar spiral operates as if the helix were not present, while below 2 GHz, the spiral functions as a transmission line feeding the helix and the helix radiates essentially all of the energy from the antenna.
The antenna system provided is approximately the same size as conventional 2 to 18 GHz cavity backed spiral antennas and generally satisfies all of the physical constraints and limitations placed upon airborne radar-warning systems.

REFERENCES:
patent: 3241148 (1966-03-01), Lechtreck
patent: 3441937 (1969-04-01), Clasby et al.
patent: 3787871 (1974-01-01), Reese
patent: 3820117 (1974-06-01), Hall et al.
patent: 3825933 (1974-07-01), Debski
"String Transmission and Helical Wave Coils" by Freedman, Radio-Electronics, June 1951, pp. 25, 26.

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