Tuned small loop antenna and method for designing thereof

Details Tuned small loop antenna and method for designing thereof Tuned small loop antenna and method for designing thereof

1982-02-12

1985-05-21

Lieberman, Eli

Communications: radio wave antennas

Antennas

High frequency type loops

343743, 343744, 455193, H01Q 1112

Patent

active

045189650

ABSTRACT:
The invention is directed to a tunable loop antenna design which provides impedance matching between the loop antenna and a feed line despite variations of the resonant frequency f.sub.o over a wide range of frequencies. The antenna has a maximum length of one tenth of the wavelength, and comprises a loop conductor and a variable capacitor connected in series with the conductor for providing a resonant circuit. The loop area of the conductor, the circumferential length and equivalent radius thereof are adjusted so that the ratio of the resonant frequency f.sub.o of the antenna and the resonant frequency f.sub.m, at which the input admittance is a minimum, is within the range:

REFERENCES:
patent: 2467962 (1949-04-01), Caraway et al.
patent: 2551664 (1951-05-01), Galper
patent: 3588905 (1971-06-01), Dunlavy, Jr.
patent: 3631499 (1971-12-01), Turner
patent: 3641576 (1972-02-01), Farbanish
patent: 3680127 (1972-07-01), Richard
patent: 3956751 (1976-05-01), Herman
patent: 4342999 (1982-08-01), Woodward et al.
R. W. P. King et al., "Antennas and Waves: A Modern Approach", MIT Press, pp. 437-438, (1969).
"Antenna Engineering Handbook", The Institute of Electronics & Communication Engineers of Japan, Chapter 7, pp. 319-321, (1980).

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