Antenna structure for providing a uniform field

Communications: radio wave antennas – Antennas – High frequency type loops

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Details

343867, 340572, H01Q007000, H01Q021000, G08B013140

Patent

active

052587665

ABSTRACT:
An apparatus for radiating a magnetic field of substantially uniform magnitude along an axis in a volume of space having width, height and depth directions includes a first coil arranged in the width and height directions and has a first imaginary point as its center. A second coil is arranged in the width and height directions with a second imaginary point at its center and is spaced from the first coil. The first and second coils each have a side and a predetermined configuration and are positioned adjacent each other, in opposite and facing configuration. The first and second coils are spaced by a distance in the range of 2.0 to 0.1 times the length of one of the coil sides. The first and second coils provide in response to a current applied to the coils, a substantially uniform field within the volume of space being located between first and second imaginary points and extending in the depth direction. Also an antenna structure for providing a three dimensional powering field of substantially constant magnitude is disclosed and includes three orthogonal coil pairs.

REFERENCES:
patent: 3500373 (1970-03-01), Minasy
patent: 3750167 (1973-07-01), Gehman et al.
patent: 3832530 (1974-08-01), Reitboeck et al.
patent: 3849633 (1974-11-01), Reitboeck et al.
patent: 3859624 (1975-01-01), Kriofsky et al.
patent: 3938125 (1976-02-01), Benassi
patent: 3990065 (1976-11-01), Purinton et al.
patent: 4906973 (1990-03-01), Karbowski et al.

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