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US 4,379,298 AGranted
Tunable citizen band antenna
AssigneePAL International
InventorsRichard G. Vincent, Frank Sacks, Robert F. Steele
Life of this patent
Estimating the term…
Abstract
An improved tunable citizen band antenna includes an adjustable tuning assembly located at the tip of a wire wound fiberglass core antenna to lengthen or shorten the effective electrical length of the antenna, so that the antenna can be tuned to a specific, desired resonant frequency, resulting in enhanced antenna radiation, reception, and power transmission.
Claims15
A tunable antenna comprised of:
- a flexible core;
- a conductive internally threaded tuning extender mounted to the top of said flexible core;
- a conductive base mounted to the bottom of said flexible core;
- a conductive wire forming an electrical path from said conductive base to said tuning extender;
- a conductive externally threaded tuning screw threaded within said conductive tuning extender;
- a conductive internally threaded jam nut coupled on said tuning screw;
- and
- a rubber "O"-ring mounted between said conductive jam nut and said conductive tuning extender.
5 more elements
A tunable antenna, comprising:
- a flexible core;
- a conductive base member coupled to the bottom of said core;
- an upper conductive member coupled to the top of said core;
- a conductive transmission line wound around said core and coupled at opposite ends to said upper conductive member and to said conductive base member to complete a conductive path;
- and
- rotatable tuning means having a conductive electrical coupling to said upper conductive member for varying the length of said conductive path.
3 more elements
Dependencies are inferred from the claim text.