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Passive RFID Basics

From Microchip Technology, Inc.
 

 
Radio Frequency Identification (RFID) systems use radio frequency to identify, locate and track people, assets, and animals. Passive RFID systems are composed of three components an interrogator (reader), a passive tag, and a host computer. The tag is composed of an antenna coil and a silicon chip that includes basic modulation circuitry and non-volatile memory. The tag is energized by a time-varying electromagnetic radio frequency (RF) wave that is transmitted by the reader. This RF signal is called a carrier signal. When the RF field passes through an antenna coil, there is an AC voltage generated across the coil. This voltage is rectified to supply power to the tag. The information stored in the tag is transmitted back to the reader. This is often called backscattering. By detecting the backscattering signal, the information stored in the tag can be fully identified.
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ELCAN Optical Technologies - Diabetes Management - Custom RFID
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Topics of Interest
Passive RFID tags utilize an induced antenna coil voltage for operation. This induced AC voltage is rectified to provide a voltage source for the device. As the DC voltage reaches a certain level, the... (Read More)
Although RF tags are not identical, they have a common identification field, usually 64–128 bits in length and a unique numerical value (see Table 5). They must have a source of electrical... (Read More)
Introduction The core functionality of an RFID system is the communication between a reader and a tag. The communication is carried out using RF waves, which are basically the EM waves with... (Read More)
In a Radio Frequency Identification (RFID) application, an antenna coil is needed for two main reasons: To transmit the RF carrier signal to power up the tag To receive data signals from the tag An RF... (Read More)
Introduction As with any system, Radio Frequency Identification (RFID) is vulnerable to attack. People that work in information security know that any system, including a RFID, can be compromised... (Read More)