Helical antenna for small portable wireless devices

Details Helical antenna for small portable wireless devices Helical antenna for small portable wireless devices

1987-12-02

1989-07-18

Sikes, William L.

Communications: radio wave antennas

Antennas

With variable reactance for tuning antenna

343895, H01Q 136

Patent

active

048497673

ABSTRACT:
A helical antenna for use with small portable wireless devices as disclosed which includes a magnetic tuner including a magnet adapted to move in a direction substantially perpendicular to the longitudinal axis of the antenna whereby the impedence of the antenna can be varied greatly by displacement of the magnet only a short distance. The antenna preferably further includes a variable capacitor for reducing any mismatching between the input impedence of the antenna and the characteristic impedence of an associated feeder which can be caused by adjusting the magnetic tuner.

REFERENCES:
patent: 3474453 (1969-10-01), Ireland
patent: 3487463 (1969-12-01), Rogers
patent: 3523251 (1970-08-01), Halstead
patent: 3781899 (1973-12-01), Lockwood
patent: 4163981 (1979-08-01), Wilson

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