Collapsible-helix antenna

Details Collapsible-helix antenna Collapsible-helix antenna

1977-02-04

1978-05-02

Lieberman, Eli

Communications: radio wave antennas

Antennas

With lumped reactance for loading antenna

343872, 343895, H01Q 136

Patent

active

040878201

ABSTRACT:
A collapsible-helix antenna, continuously variable in length and self-resonant with a uniform resistance over an exceedingly wide frequency range, for example 2-32 mHz. The collapsible-helix is continuous in two sections: a fixed-length, shorted-out section wherein the turns of the helix are collapsed upon each other; and a variable-length section wherein the helix has an approximately constant pitch, and is a radiating element. Means are provided to drive turns of the helix from either section to the other, providing a helix with continuously variable physical and electrical length.

REFERENCES:
patent: 3510872 (1970-05-01), Mullaney
patent: 3836979 (1974-09-01), Kurland et al.
patent: 3858220 (1974-12-01), Arnow

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