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US 4,163,981 AGranted
Spring tunable helical whip antenna
OwnerThomas J. Wilsoninventor
Life of this patent
Estimating the term…
Abstract
A spring tunable antenna for mounting to the frame of a vehicle. The antenna includes a base adapted to be mounted on the vehicle, a flexible rod supported at its lower end in the base, and a low-resistance wire conductor wound helically around the rod. The conductor windings in the tip region of the rod are selectively movable, whereby the antenna may be tuned.
Claims2
A spring tunable antenna mountable on the frame of a vehicle or the like comprising,
- a base mountable on the vehicle,
- a flexible rod mounted at one of its ends on said base, said rod having a tip region opposite said one end, and a body region intermediate said base and said tip region,
- a low-resistance conductor attached to said base and wound helically about said rod to form a plurality of helical windings encircling said rod, said windings encircling said body region having substantially fixed positions relative thereto, and said windings encircling said tip region forming a coiled spring which is adjustable selectively between compressed and extended position, wherein said spring encircles lesser and greater portions of said tip region, respectively, and
- means for securing said spring at a preselected position between said compressed and extended positions, said means including a tape which is securable about said spring to encase the same in a plurality of helical wrappings, and which is releasable selectively to permit adjustment of said spring.
1 more element
Dependencies are inferred from the claim text.