Patent ID: 6356764
Filing Date: 2002-03-12
Classification: G06K,H04W

Abstract:
An interrogator of a radio frequency identification system comprising:a plurality of communication stations individually including: a first antenna configured to output a forward link wireless signal; a second antenna configured to receive a return link wireless signal responsive to the outputting of the forward link wireless signal and to output a return link communication signal corresponding to the return link wireless signal; and a low noise amplifier coupled with the antenna and configured to increase the power of the return link communication signal; a plurality of coaxial RF cables coupled with the low noise amplifiers of the respective communication stations and individually configured to communicate the return link communication signal of the respective communication station; and a housing remotely located with respect to the communication stations and including: a plurality of automatic gain control circuits coupled with respective ones of the coaxial RF cables and configured to adjust at least one electrical characteristic of the respective return link communication signals to output the return link communication signals at a substantially constant level; and processing circuitry configured to receive the return link communication signals from the automatic gain control circuits and to process the return link communication signals.