Communications: radio wave antennas – Antennas – Loop type
Patent
1992-01-08
1993-12-28
Wimer, Michael C.
Communications: radio wave antennas
Antennas
Loop type
340505, H01Q 700
Patent
active
052743926
ABSTRACT:
A novel antenna system disposed around a conveyor belt for the interrogation of objects passing through the antenna which overcomes centralized dead zone problems is disclosed. A frame antenna is disposed around a conveyor belt and is tilted to form, for example, a 30 deg. angle with the vertical longitudinal plane of the conveyor belt, which is perpendicular to the horizontal plane within which the conveyor belt lies, and a 30 deg. angle with the transverse axis of the conveyor belt. In this way, a "dead-zone" free read area is formed to facilitate the read of a transponder oriented in any manner as it moves along the conveyor belt.
REFERENCES:
patent: 3754226 (1973-08-01), Fearon
patent: 4326198 (1982-04-01), Novikoff
patent: 4384281 (1983-05-01), Cooper
patent: 4679046 (1987-07-01), Curtis et al.
D'Hont Loek
Schuermann Josef H.
Donaldson Richard L.
Ho Tan
Kesterson James C.
Mapstone Rebecca A.
Texas Instruments Incorporated
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