Method and apparatus for tuning a loop antenna

Details Method and apparatus for tuning a loop antenna Method and apparatus for tuning a loop antenna

1994-05-02

1995-11-21

Hajec, Donald

Communications: radio wave antennas

Antennas

High frequency type loops

343703, 343741, 343742, 343745, 343748, 455123, H01Q 1112

Patent

active

054691800

ABSTRACT:
A method and apparatus for rapidly determining the resonance of a loop antenna (7). In order to set the loop antenna (7) to the desired operating frequency, the antenna is used with an amplifier (15). In view of the high Q provided by the loop, it is used at the output of the amplifier (15) to create a tank circuit. The loop is adjusted to create the proper amount of phase shift driving the amplifier (15) into oscillation. The antenna is then tuned to allow the amplifier (15) to oscillate at a desired frequency. This frequency is monitored on a frequency counter. When the desired frequency is attained, the loop antenna is properly adjusted and can be connected to a transmitter. The invention allows quick and easy adjustment of the loop antenna without having to apply RF energy to the antenna or make VSWR calculations.

REFERENCES:
patent: Re18140 (1931-07-01), Phillips
patent: 1479638 (1924-01-01), Zworykin
patent: 1483383 (1924-02-01), Sandell
patent: 1997271 (1935-04-01), Zepler
patent: 2185336 (1940-01-01), Gerardi
patent: 2751590 (1956-06-01), Troutman
patent: 3618083 (1971-11-01), Burley et al.
patent: 4206403 (1980-06-01), Tucker
patent: 4593412 (1986-06-01), Jacob
patent: 5278997 (1994-01-01), Martin
patent: 5296866 (1994-03-01), Sutton
United States Air Force, Antenna Systems, Jun. 1953, pp. 278-284.
QST Magazine, "You Can Build: A Compact Loop Antenna for 30 through 12 Meters", by Robert Capon, May 1994, pp. 33-36.

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