Ground-plane antenna with impedance matching

Details Ground-plane antenna with impedance matching Ground-plane antenna with impedance matching

1982-09-10

1985-06-04

Lieberman, E.

Communications: radio wave antennas

Antennas

With grounding structure

343862, H01Q 148

Patent

active

045217840

ABSTRACT:
An improved ground-plane antenna with a quarterwave resonant radiating rod (1) made of a hollow tube in which a central earthing rod (7) is arranged to form with the internal cylindrical wall of the radiating rod a line section short-circuited at the upper end, and a further line section (16) open at the lower end is arranged in the extension of the short-circuited line section to form a combined tapped line section therewith having an electrical length substantially equal to the quarterwavelength, in which the combined line section is coupled with its tapping points in parallel to the input terminals of the antenna, whereby the susceptance represented by the combined line section is capable of compensating the changes of the antenna reactance within a fairly wide band.

REFERENCES:
patent: 2184729 (1939-01-01), Bailey
patent: 4095231 (1978-04-01), Carter
Amateur Radio Handbook: Hooton, Howard W. Sams Co., Inc., May 1962, pp. 75-81.

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