Linearly polarized omnidirectional antenna

Details Linearly polarized omnidirectional antenna Linearly polarized omnidirectional antenna

1981-06-01

1983-01-18

Moore, David K.

Communications: radio wave antennas

Antennas

Active sleeve surrounds feed line

343792, H01Q 920

Patent

active

043694497

ABSTRACT:
A linearly polarized omnidirectional antenna includes one or more dipoles having an elongated tubular conductive radiator of a length that is about half the wavelength of the midband frequency, and an elongated inner conductive member extending longitudinally through the interior of the radiator and spaced therefrom. A coaxial cable or other feed means conducts signals to and from one end of the radiator and to and from the inner conductive member. The impedances of the dipole and the feed means are matched over a selected frequency band, such as by the use of a series inductive reactance between the feed means and the radiator. Two such dipoles can be connected to a colinear, center-fed pair, and two or more such dipole pairs can be arranged in a colinear array having a common inner conductive member.

REFERENCES:
patent: 3159838 (1964-12-01), Facchine
patent: 4117490 (1978-09-01), Arnold et al.

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