What is the relationship between frequency and tag/antenna distance?
Passive high-frequency (HF, typically 13 MHz) and low-frequency (LF, around 125 kHz) systems typically exhibit a read range of less than 3 feet.
With HF and LF tag systems, the size of a tag (and hence area of antenna) will have a significant impact on read range.
Some applications limit the read range to around 6 to 8 inches. Some newer technologies(UHF systems) do have a longer read range that can be 20 to 25 feet, but these systems are intended for pallets andshipping crates.
Read range depends on many factors, but the size of the transponder’s antenna, the size of the reader’s antenna,and its output power are the main factors to consider. With battery-less transponders, long read range and small size are mutually exclusive.
The Central Bank may embed RFID chips in the note. Ostensibly to combat counterfeiters and money-launderers.
It would also enable banks to count large amounts of cash in seconds. Unfortunately, such a move would also makes it possible for governments to track the passage of cash from individual to individual.
Cash is the last truly anonymous way to buy and sell. With RFID tags, that anonymity would be gone.
In addition, banks would not be the only ones who could in an instant divine how much cash you were carrying; criminals can also obtain power transceivers.
The first RFID passports (" E-passport ") were issued by Malaysia in 1998. In addition to information also contained on the visual data page of the passport, Malaysian e-passports record the travel history (time, date, and place) of entries and exits from the country.
Schools and universities
School authorities in the Japanese city of Osaka are now chipping children's clothing, back packs, and student IDs in a primary school.
RFID technologies are now also implemented in end-user applications in museums. An example was the custom-designed temporary research application, "eXspot," at the Exploratorium , a science museum in San Francisco, California .
Passive RFID systems are being used at conferences and live events. Attendees at these events are outfitted with passive tags that are read by temporary antennae placed outside educational session rooms or throughout exhibition halls.
RFID tags used in libraries: square book tag, round CD/DVD tag and rectangular VHS tag.
Among the many uses of RFID technology is its deployment in libraries . This technology has slowly begun to replace the traditional barcodes on library items (books, CDs , DVDs , etc.). The RFID tag can contain identifying information, such as a book's title or material type, without having to be pointed to a separate database