Radio-frequency identification system

Details Radio-frequency identification system Radio-frequency identification system

1988-09-26

1990-05-15

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

342 44, H01Q 2106, G01S 1374

Patent

active

049261878

ABSTRACT:
A radio-frequency identification (RF-ID) system including a master unit and a sub unit connected thereto by radio-communication, and used for identifying a moving article on which the sub unit is mounted. The master unit transmits a circularly polarized wave having two carrier components (CW1, CW2), and the sub unit, which does not include carrier generators and branching filters, is powered by a battery provided therein. The sub unit receives the circularly polarized wave, separates the two carrier components by a hybrid circuit, and transmits another circularly polarized wave base upon the received carrier component. The sub unit may be operated in response to a starting command from the main unit, and the main unit may have first and second detecting units separated by n.multidot..lambda.g/8, n: an odd integer, and .lambda.g: effective wave length, to eliminate the occurrence of null point phenomenon.

REFERENCES:
patent: 4360810 (1982-11-01), Landt
patent: 4737793 (1988-04-01), Munson et al.

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