Method and apparatus for detecting an RFID tag signal
US6094173A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 18, 1997 |
| Grant date | Jul 25, 2000 |
| Priority date | — |
| Expiry date | Apr 18, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01Q11/12
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.