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Some active RFID systems (which have a power source) have repeaters that will pick up a signal broadcast by tags and send it on to the reader antenna, thereby increasing the distance at which tags can be read. Mesh networks, meanwhile, are made up of devices that are essentially readers and tags. They can receive a signal and pass it on to another node and then another until it reaches a node connected to a base station, which passes the data on to the backend software.
If you are talking about passive tags, then no, this would not be possible. Passive tags have no ability to capture data from other passive tags, any more than bar codes do. To increase the read range, you could use either battery-assisted tags or readers with phased-array antennas, which point a narrow beam toward a tag in order to read it from as much as 90 feet away.
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How Are Algorithms Used in an RFID System? »