Communications: radio wave antennas – Antennas – Including magnetic material
Patent
1985-02-11
1987-04-14
Lieberman, Eli
Communications: radio wave antennas
Antennas
Including magnetic material
343895, 343572, H01Q 136, H01Q 708, G08B 1326
Patent
active
046582630
ABSTRACT:
A dual antenna is provided for energizing and receiving a response from a closely coupled marker providing an identifiable signal. An elongated drive coil is wound on a substantially flat winding template and defines a longitudinal axis of the antenna. Each winding of the drive coil extends in a plane substantially perpendicular to the longitudinal axis. A receive coil has at least one elongated loop extending substantially parallel to the antenna axis with a first portion of the loop being overlapped by the drive coil; said first portion extending substantially perpendicular to the longitudinal axis of the antenna. One portion of the receive coil is outside the drive coil; the drive coil being substantially the same length as the marker with the receive coil being substantially as wide as the marker to optimize the signal. In one embodiment, a plurality of receive coil loops is provided to decrease the longitudinal sensitivity. Preferably, the winding template includes a U-shaped slot for receiving the first portion of the receive coil and a reduced section to receive the second portion. The template is preferably magnetic barium ferrite mixed with a plastic binder to provide a dc bias field for activation the marker. In additional embodiment, multiple receive coils are provided side-by-side to allow simultaneous reading of multiple ribbon marker.
REFERENCES:
patent: 3683389 (1972-08-01), Hollis
patent: 3790945 (1974-02-01), Fearon
patent: 3852755 (1974-12-01), Works et al.
patent: 4510489 (1985-04-01), Anderson, III et al.
Allied Corporation
Buff Ernest D.
Fuchs Gerhard H,.
Lieberman Eli
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