Method and apparatus for detecting an RFID tag signal

Details Method and apparatus for detecting an RFID tag signal Method and apparatus for detecting an RFID tag signal

1997-04-18

2000-07-25

Kim, Robert H.

Communications: radio wave antennas

Antennas

High frequency type loops

343867, 343866, 343741, 340572, H01Q 1112

Patent

active

060941731

ABSTRACT:
An antenna array for detecting a coded radio frequency identification (RFID) tag signal generated by a tag during passage of the tag through a detection volume, or portal. The array comprises at least first and second antennas disposed at different positions around the periphery of the detection volume, and circuitry, having inputs connected to receive the respective output signals from the first and second antennas and an output connected to a signal receiver for decoding the detected signal. The circuitry provides an output signal including the respective output signals of the first and second antennas, and the sum of the output signals of the first and second antennas. Preferably, the output signal of the circuitry additionally includes the inverse of the output signal of the second antenna, and the sum of the output signal of the first antenna and the inverse of the output signal of the second antenna.

REFERENCES:
patent: 5126749 (1992-06-01), Kaltner
patent: 5142292 (1992-08-01), Chang

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