Communications: radio wave antennas – Antennas – Rod type
Patent
1990-12-20
1993-03-23
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Rod type
343877, H01Q 108, H01Q 930
Patent
active
051968584
ABSTRACT:
A deployable crossed log-periodic dipole array antenna includes a plurality of bays, each associated with four elongated, flexible antenna elements, each element having an S-shaped cross-section for stiffness. Each bay also includes a spool. The spools have a "squared circle" shape adapted to the natural curvature of the antenna elements. A drum surrounds and is coaxial with all the spools, and the antenna elements extend through apertures in the drum. Rotation of the drum winds and unwinds the flexible antenna elements from their spools simultaneously. When the drum begins to wind for retraction of the elements toward a stowed condition, some bays are arranged so that the elements begin to wind about the spools immediately, whereas other bays are arranged so that the antenna elements rotate about hinges over an angle such as 90.degree. or 180.degree. before beginning to wind onto their spools. The spools of the various bays have effective diameters selected to stow and deploy antenna elements of different lengths in response to the same angular rotation of the drum.
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"Space Antenna Selection and Design" by Brown et al., published in the Oct., 1965 issue of Systems Design magazine.
Berard Clement A.
General Electric Co.
Meise William H.
Wimer Michael C.
Young Stephen A.
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