An enhanced backscatter RF-ID tag reader system and multiprotocol RF tag reader system is provided. In a multiprotocol mode, the system emits a non-stationary interrogation signal, and decodes a phase modulated backscatter signal by detecting a stronger phase component from quadrature phase representations...http://www.google.fr/patents/US6950009?utm_source=gb-gplus-shareBrevet US6950009 - Dual mode transmitter/receiver and decoder for RF transponder units
Dual mode transmitter/receiver and decoder for RF transponder units
