Optical interface between receiver and tag response signal analyzer in RFID system for detecting low power resonant tags
US5959531A · kind A · utility
142Cited by
20References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1998 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jul 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B10/25758
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Noise reduction schemes are provided in a radio frequency identification (RFID) system for use with RFID intelligent tags. Fiber optics are used to communicate analog tag response signals from the output of the receiver circuit to the input of a tag response signal analyzing module, which includes a digital signal processor (DSP). The fiber optics creates electrical isolation between these circuit elements breaking ground loops, stopping internal switching noise from the DSP from entering the receiver circuitry, and preventing common mode signals from interfering with the desired RFID tag signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.