Automatic antenna tuning system

Details Automatic antenna tuning system Automatic antenna tuning system

1991-02-07

1993-07-06

Hille, Rolf

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

343861, 455123, 333 173, H01Q 900

Patent

active

052258475

ABSTRACT:
In an automatic tuning system for an antenna having a single variable reactance element, the power transmitted to the antenna and the power reflected from the antenna on the feedline are sensed. The variable reactance component of the antenna is adjusted until the ratio between the transmitted and reflected power on the feedline indicates that the standing wave ratio on the feedline is at a minimum, whereupon the antenna will be tuned. The adjustment of the variable reactance component is by a stepping motor controlled by a microprocessor, which is programmed to make calculations to determine when the standing wave ratio reaches a minimum.

REFERENCES:
patent: 3381222 (1968-04-01), Gray
patent: 3475703 (1969-10-01), Kennedy et al.
patent: 3550137 (1970-12-01), Kuecken
patent: 3588905 (1971-06-01), Dunlavy, Jr.
patent: 3778731 (1973-12-01), Oomen
patent: 4234960 (1980-11-01), Spilsbury et al.
patent: 4343001 (1982-08-01), Anderson et al.
patent: 4356458 (1982-10-01), Armitage
patent: 4380767 (1988-04-01), Goldstein et al.
patent: 4493112 (1985-01-01), Bruene
patent: 4965607 (1990-10-01), Wilkins et al.

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