Ferrite antenna

Details Ferrite antenna Ferrite antenna

1980-09-15

1982-01-19

Lieberman, Eli

Communications: radio wave antennas

Antennas

Including magnetic material

343719, H01Q 708

Patent

active

043120032

ABSTRACT:
A ferrite antenna assembly comprising a ferrite rod surrounded by a first coil and positioned within a surrounding ferrite or the like cylinder provided with a second coil. A signal which is 180.degree. out of phase with the signal on the first coil is applied to the second coil to induce a radio-frequency magnetic field in opposition to the field produced by the ferrite rod antenna. The opposing field creates a high reluctance return path for the magnetic flux emitted from the ferrite antenna at angles deviating from the axis of the rod. This forces the magnetic flux from the rod further out from the axis of the antenna, thus increasing the efficiency and range of the antenna.

REFERENCES:
patent: 4148036 (1979-04-01), Miller

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