Communications: radio wave antennas – Antennas – With lumped reactance for loading antenna
Patent
1979-11-19
1982-11-23
Moore, David K.
Communications: radio wave antennas
Antennas
With lumped reactance for loading antenna
343715, H01Q 900
Patent
active
043608140
ABSTRACT:
A trimming device for a whip antenna, and the like, wherein two coaxial coils are connected in series with each other and with the antenna whip; and a tuning ring is positioned in the combined external magnetic field of both coils. The tuning ring, being in the external field, has an annular flow of electricity induced therein which in turn produces a magnetic field which opposes that of the coils. In the preferred arrangement, an insulating spacer sheet is wrapped over the inside coil, and the outside coil is wound tightly over the spacer sheet to provide a predetermined amount of intercapacitance between the coils, which can be changed by changing the thickness of the spacer sheet.
REFERENCES:
patent: 2636122 (1953-04-01), Hayes
patent: 4080604 (1978-03-01), Wosniewski
Hickey William Preston
Moore David K.
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