Loop antenna with series resonant circuit and parallel reactance

Details Loop antenna with series resonant circuit and parallel reactance Loop antenna with series resonant circuit and parallel reactance

1993-08-27

1995-06-06

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With vehicle

343744, 343748, H01Q 700, H01Q 500

Patent

active

054226503

ABSTRACT:
A loop antenna (10) is provided with feed means (12,14) and a variable capacitor (C1) to adjust a first resonant frequency of the antenna (10). A reactive network (C2,L2,X) is included which permits the antenna to provide a further resonant frequency. The reactive network comprises a series-resonant circuit (L2,C2) in parallel with a further reactive element (X). The resonant frequency of the series-resonant circuit is arranged to be substantially equal to the first resonant frequency of the antenna as tuned by the capacitor (C1). The reactance (X) thus has no effect at this frequency. Another resonant frequency for the antenna may be adjusted by altering the reactance (X). The arrangement may be extended to provide further resonant frequencies.

REFERENCES:
patent: 2650303 (1953-08-01), Schlesinger
patent: 3599214 (1971-08-01), Altmayer
patent: 3623110 (1971-11-01), Doi et al.
patent: 3725940 (1973-04-01), Siple
patent: 3902177 (1975-08-01), Mori et al.
"CD By Radio Digital Audio Broadcasting", by H. Price, IEEE Review, Apr. 1992, pp. 131-135.

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