Ground-plane antenna

Details Ground-plane antenna Ground-plane antenna

H - Electricity

01

Q

351/49

H01Q 9/38 (2006.01) H01Q 9/40 (2006.01)

Patent

CA 1191252

ABSTRACT OF THE INVENTION 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 substantial- ly 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.

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