Elastic strain energy deployable helical antenna

Communications: radio wave antennas – Antennas – Spiral or helical type

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H01Q 136

Patent

active

040682382

ABSTRACT:
An elastic strain energy deployable helical antenna having a tubular resiliently flexible antenna element of relatively flat oval cross-section fixed at one end to a support and formed into a normally extended, resiliently compressible helix with the major axis of the oval cross-section of the element substantially normal to the longitudinal axis of the helix, and flexible tension members of shorter overall length than the fully extended length of the helix fixed at one end to the support and extending axially of the helix across and secured to its helical turns. The antenna helix is compressible axially to a contracted length for storage and is deployable axially by stored elastic strain energy to an extended operating length at which the tension members are stressed in tension by the helix to reinforce the latter against deflection laterally of its longitudinal axis. The tension members may have rigid portions between the helix turns for increasing the natural frequency of vibration of the antenna.

REFERENCES:
patent: 3524190 (1970-08-01), Killion et al.
patent: 3699585 (1972-10-01), Morrison
patent: 3858220 (1974-12-01), Arnow
patent: 3913109 (1975-10-01), Owen

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