Communications: electrical – Continuously variable indicating – With meter reading
Patent
1993-12-27
1997-03-25
Zimmerman, Brian
Communications: electrical
Continuously variable indicating
With meter reading
34082554, 340572, 343703, 119 5102, H04Q 100
Patent
active
056148909
ABSTRACT:
A personal identification system includes a number of antenna preamplifier nodes coupled to collection nodes which are in turn coupled to a central computer. A personal detector unit attached to a user is inserted into an enclosure of the antenna preamplifier node. The antenna preamplifier node is electrically isolated by RF attenuation material. An antenna of the antenna preamplifier node is a low gain antenna. The antenna preamplifier node reads a coded radio frequency signal of a personal detector unit inserted into an enclosure and rejects signals of other various personal detector units in the vicinity.
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Bogacz Frank J.
Motorola Inc.
Zimmerman Brian
LandOfFree
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