RESOURCE CENTER - Bar Code and RFID Industry Association" - The Worlds RFID Authority - RFID according to Wikipedia

Active & Passive RFID

Passive RFID tags have no internal power supply. The antenna has to be designed both to collect power from the incoming signal and also to transmit the outbound backscatter signal. The response of a passive RFID tag can contain non-volatile, possibly writable EEPROM for storing data. They have read distances ranging from about 10 cm (4 in.) up to a few meters, depending on the chosen radio frequency and antenna design/size. The lack of an onboard power supply means that the device can be quite small: commercially available products exist that can be embedded in a sticker, or under the skin in the case of low frequency RFID tags.

Unlike passive RFID tags, Active RFID tags have their own internal power source. Active tags are typically much more reliable (i.e. fewer errors) than passive tags due to the ability for active tags to conduct a "session" with a reader. Active tags, also transmit at higher power levels than passive tags, allowing them to be more effective in "RF challenged" environments like water (including humans/cattle, which are mostly water), metal (shipping containers, vehicles), or at longer distances, generating strong responses from weak requests (as opposed to passive tags, which work the other way around). Many active tags today have practical ranges of hundreds of meters, and a battery life of up to 10 years. Active tags typically have much longer range (approximately 500 m/1500 feet) and larger memories than passive tags, as well as the ability to store additional information sent by the transceiver. For More Information on Leveraging Active & Passiver RFID for; Asset & Personell Tracking, Access Control, Tool Management and other cost saving soluionts, please Contact US.

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