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CHAPTER 2 The RF in RFID
These two calculations show that the link budget from the interrogator to the tag to power the tag is the limiting factor for the UHF tags If tags can be powered at a greater distance, they can be read further than 16 feet (5 meters)
Exam Tip
For passive RFID tags at UHF and microwave frequencies, know that the read range is limited by the distance at which the tag can be powered, not from how far the tag may be interrogated
Unlicensed Operation and Frequency Hopping
Unlicensed operation means you are not required to get a permit from a regulatory agency, such as the FCC in the United States, to operate a radio frequency device Ranges of frequencies have been set aside by regulatory agencies all over the world, and these fall into an unlicensed category collectively called Industrial, Scientific, and Medical (ISM) bands Unlicensed does not mean unregulated, however Many aspects of this band are regulated, including which frequencies can be used for what purposes, maximum amount power that can be radiated, and the duty cycle of the device operation These regulations are published by the regulatory authority in each country and vary from country to country All device manufacturers using ISM bands must have regulatory agency certification that their devices operate according to the regulations and must prominently display this certification logo Unlicensed devices must not cause harmful interference to other radio services The operator of the device is responsible for correcting any harmful interference that results from the use of the device
Travel Assistance
Unlicensed operation is covered in more detail in 10
Because of their unlicensed nature, ISM bands are popular for establishing wireless data links with short-range wireless devices With the increase in popularity there is an increase in the number of devices operating in ISM This has created a congested frequency spectrum, resulting in more interference that can degrade performance of wireless devices
MIKE MEYERS COMPTIA RFID+ CERTIFICATION PASSPORT
To reduce the probability of interference, systems are often designed to use spread-spectrum In spread-spectrum, the device uses a narrow band carrier and changes frequency in a given pattern It transmits at one frequency for a short period of time and then switches to another Only a fixed number of frequencies are available for a particular group of applications, and they are called channels The switch from one channel to another is called a frequency hop In a frequency hopping system, the available channel bandwidth is subdivided into a large number of contiguous frequency slots In any signaling interval, the transmitted signal occupies one of the available frequency slots Selecting the frequency slots during each signaling interval is made pseudorandomly Due to the random nature of frequency slot selection, the chances of two similar devices operating at the same slot are reduced Another advantage of this system is that they are often more immune to interference from other types of systems operating in the same frequency range The probability of interception is reduced, because frequency hopping signals have a low average power density at any given slot, which can make these signals difficult to intercept Also pseudorandom frequency hopping makes these signals difficult to demodulate, if intercepted, by unintended receivers
Signal Interception and Security
RFID communication occurs in an open environment without any solid encryption Therefore, the signals, if received by an unintended receiver, can be easily interpreted The response from tags operating at around 900 MHz can be decoded at up to 71 meters in open air, as was calculated earlier in the discussion of link budget If this signal passes through a wall, it loses some strength, depending on the type of wall, but it may still be intercepted and demodulated by a good receiver at 20 to 30 meters The unintended receiver will not be able to power the tag at that distance, but once powered by the authorized interrogator, the signals could be intercepted at a longer distance In addition to the security issues, problems of reading out-of-process tags, the tags that are not inside the intended read zone, could result This should be considered when you are designing an RFID system
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