Communications: radio wave antennas – Antennas – Spiral or helical type
Patent
1982-08-27
1983-12-20
Moore, David K.
Communications: radio wave antennas
Antennas
Spiral or helical type
343749, H01Q 136
Patent
active
044220782
ABSTRACT:
A rod of dielectric material of uniform diameter of about 9.5 mm and about 1.2 meters in length supports about 8.4 meters of insulated copper wire of about 1.6 mm diameter coiled about the rod to form adjacent one end a base coil of at least three tight turns and at the opposite end five tight loading coils each about 5.5 centimeters in length and spaced apart from each other about 6.4 mm. A tight trim coil is spaced about 6.4 mm from the outermost one of the loading coils and contains a number of turns 6.4 mm from the outermost one of the loading coils and it contains a number of turns selected to optimize the standing wave ratio of the adjacent coils. The length of wire between the base coil and innermost one of the loading coils is coiled about the rod in single wide turns to minimize radiation therefrom. Shrink tubing overlies and conceals the wire. The base coil end of the rod is secured to a mounting support from which the rod extends vertically upward, and the free end of the base coil wire is arranged for connection to an 11 meter citizens band transceiver.
REFERENCES:
patent: 4101898 (1978-07-01), Ingram
patent: 4161737 (1979-07-01), Albright
Moore David K.
Olson Oliver D.
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