Directional antenna configuration for asset tracking system

Details Directional antenna configuration for asset tracking system Directional antenna configuration for asset tracking system

1995-06-19

1997-08-26

Mullen, Thomas

Communications: electrical

Condition responsive indicating system

Specific condition

340523, 34082534, 340990, 342417, 343742, G08B 1314

Patent

active

056614578

ABSTRACT:
A directional antenna configuration for use in an article tracking system includes two shorted loops, one on each side of a portal and in each case circumscribing the portal. The antenna configuration also includes a respective pair of passage antennas provided on each side of the portal. The passage antennas are all arranged in planes parallel to the path of travel through the doorway. The respective loops confine the effective detection areas of each pair of passage antennas to the respective side of the portal. The antenna configuration permits reliable detection of direction of movement through the portal.

REFERENCES:
patent: 3745450 (1973-07-01), Wilt
patent: 4272762 (1981-06-01), Geller et al.
patent: 4303910 (1981-12-01), McCann
patent: 4471345 (1984-09-01), Barrett, Jr.
patent: 4489313 (1984-12-01), Pfister
patent: 4798175 (1989-01-01), Townsend et al.
patent: 4888579 (1989-12-01), ReMine et al.
Texas Instruments, TIRIS Automatic Radio Frequency Identification System, 1994.

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