Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1991-05-31
1993-06-01
Hille, Rolf
Communications: radio wave antennas
Antennas
Spiral or helical type
343752, 343828, 343899, H01Q 1360, H01Q 11040, H01Q 11080, H01Q 1080
Patent
active
052164365
ABSTRACT:
A collapsible `bedspring` monopole antenna is configured to be effectively non-observable in its collapsed condition and, when deployed, remains sufficiently compact to ensure very low observability characteristics, while providing broadband coverage over a wide viewing aperture. The antenna is comprised of a conductor formed as a tapered helix. One end of the conductor is coupled to an antenna feed. The outer end of the helix is looped around on itself to form a circular loop. A plurality of substantially rectilinear `radials` are soldered to distributed locations around its circular loop, so as to extend outwardly and tangentially from the outer perimeter of the loop and provide `top hat` capacitive matching elements. To define the height of the deployed antenna and to electrically short out plural locations of the helix, a plurality of conductive straps are joined to respective spaced apart locations of the helix. When allowed to expand toward its deployed configuration, the bedspring imparts a tensile force to the straps, which are pulled taught, thereby limiting the expansion of the bedspring. That portion of the helix between the closest point of strap attachment and its feed point effectively inserts an inductance in the antenna circuit path between the feed point and what is effectively an `open mesh cone-shaped monopole`.
REFERENCES:
patent: 2964748 (1960-12-01), Radford
patent: 2982964 (1961-05-01), Bresk et al.
patent: 3035266 (1962-05-01), Marshall
patent: 3510872 (1970-05-01), Mullaney
patent: 3618109 (1971-11-01), Werner
patent: 4498084 (1985-02-01), Werner et al.
Arnold M. Phillip
Hall John P.
Kabana Thomas J.
Massanova Albert J.
Brown Peter Toby
Harris Corporation
Hille Rolf
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