Two-frequency impedance matching circuit for an antenna

Details Two-frequency impedance matching circuit for an antenna Two-frequency impedance matching circuit for an antenna

1994-02-28

1996-02-20

Wimer, Michael C.

Communications: radio wave antennas

Antennas

With coupling network or impedance in the leadin

343900, H01Q 150

Patent

active

054933110

ABSTRACT:
In order to achieve two-way communications at two different frequencies, an impedance matching circuit is coupled to an antenna. The circuit includes a first inductor which is directly coupled to the antenna. The first inductor induces antenna input impedance to be capacitive at a first resonant frequency and induces the antenna input impedance to be inductive at a second resonant frequency. The first resonant frequency is lower than the second resonant frequency. Further, a first capacitor is coupled to the first inductor. By providing the first capacitor, a reactance component at the first resonant frequency is rendered substantially equal to a reactance component at the second resonant frequency. Further, the circuit includes a second inductor and a second capacitor which are coupled between the second means and a feeder. The combination of the second inductor and the second capacitor is provided to adjust impedance, defined by the antenna and the first inductor and the first capacitor, to characteristic impedance of the feeder at the first and second resonant frequencies.

REFERENCES:
patent: 1604981 (1926-11-01), Elsasser
patent: 3812494 (1974-05-01), Howell et al.
patent: 4181889 (1980-01-01), Davis et al.
patent: 4583097 (1986-04-01), Kropielnicki
patent: 5089829 (1992-02-01), Haruyama et al.
Patent Abstracts of Japan, vol. 13, No. 259 (E-773) (3607) 15 Jun. 1989, of JP 1-54906 (Mar. 1989).
Patent Abstracts of Japan, vol. 13, No. 114 (E-730) (3462) 20 Mar. 1989, of JP 63-286008 (Nov. 1988).
By Y. Nemlikher et al., "Octave Transformers of Impedances Employing LC Elements", Telecommunications and Radio Engineering, Jan. 1992, vol. 47, No. 1, pp. 120-123.

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