Ferrite core marker

Details Ferrite core marker Ferrite core marker

1995-02-22

1998-06-16

Hajec, Donald T.

Communications: radio wave antennas

Antennas

Including magnetic material

343719, 343787, H01Q 708

Patent

active

057678162

ABSTRACT:
A passive electronic marker uses a plurality of ferrite cores to increase locating range, and the cores are attached in such a manner that a slight bend of the marker at a junction between the cores does not significantly affect the markers performance. Stable locating range and tuned frequency are achieved by controlling the air gap between the cores, using specially shaped ends or a sphere which is positioned between the cores. By selecting the appropriate geometry for the core ends and winding interconnections, the first order permeability across the air gap is held constant during bending of the marker.

REFERENCES:
patent: 2539476 (1951-01-01), Rines
patent: 2624004 (1952-12-01), Polydoroff
patent: 2702860 (1955-02-01), Farbanish
patent: 2755468 (1956-07-01), Mountjoy
patent: 3051103 (1962-08-01), Morrow
patent: 3564551 (1971-02-01), Mills et al.
patent: 3569972 (1971-03-01), McEvoy
patent: 3836842 (1974-09-01), Zimmermann et al.
patent: 4148036 (1979-04-01), Miller
patent: 4811030 (1989-03-01), Pedersen

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