Proximity identification system with flux concentration in opera

Details Proximity identification system with flux concentration in opera Proximity identification system with flux concentration in opera

1991-03-14

1992-10-27

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082564, 343788, H04Q 700

Patent

active

051593327

ABSTRACT:
A proximity identification system incorporating ferrite rods. The rods are used in both the reader and the tag and additional rods may be used to strengthen and concentrate the flux field in the regions near the reader to obtain better performance in such regions. A coding system requiring minimum power for the tag is also described.

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patent: 4333072 (1982-06-01), Beigel
patent: 4384288 (1983-05-01), Walton
patent: 4550444 (1985-10-01), Uebel
patent: 4920340 (1990-04-01), Mizuno
Lay, "Recent Developments in Reduced Size VLF/LF Communications Antennas", National Telecommunications Conf. vol. III, p. 20D-1 to 5, Nov. 1973.

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