Maximum read distance of 1.5 meters (4 foot 11 inches) - usually under 1 meter (3 feet) and you can use a single or multi port reader plus custom antennas to extend the read range to longer tag read distances or a wider RFID read zone.
Radio Frequency Identification (RFID) is the wireless non-contact use of radio frequency waves to transfer data. Tagging items with RFID tags allows users to automatically and uniquely identify and track inventory and assets.
It depends on the vendor, the application, and type of tag, but typically a tag carries no more than 2 kilobytes (KB) of data—enough to store some basic information about the item it is on. Simple “license plate” tags contain only a 96-bit or 128-bit serial number.
Assuming you are using a gen2 RFID tag, writing to the tag is fairly simple. You simply tell the reader (via a command) to encode the tag.
The easiest way to kill an RFID, and be sure that it is dead, is to throw it in the microwave for 5 seconds. Doing this will literally melt the chip and antenna making it impossible for the chip to ever be read again. Unfortunately this method has a certain fire risk associated with it.
The answer was an electronic lock, and the company has given its handful of employees the option of using an electronic key or getting an RFID chip implanted in their arm. "It can't be read, it can't be tracked, it doesn't have GPS," Darks said.
The RFID tag does not have an in-built energy source, so the tag alone emits no waves and poses no immediate danger. However, the tag communicates when it comes to the electromagnetic field of a reader. It is this reader that emits electromagnetic waves at a certain power.
The advantages of a passive tag are: The tag functions without a battery; these tags have a useful life of twenty years or more. The tag is typically much less expensive to manufacture. The tag is much smaller (some tags are the size of a grain of rice).
Because the tag is sending out a signal, like a cell phone, the tags can be read from much further away—1,000 meters or more. You can cover a large area with fewer readers than a passive RTLS, but the tags cost more. The location accuracy of an active RTLS is usually within 3 meters.
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