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Passive RFID Basics
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Passive RFID Basics
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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.
Products & Services
Radio frequency identification (RFID) products read or write data to RF tags that are present in a radio frequency field projected from RF reading/writing equipment.
RF test equipment generates test signals or analyzes transmitted signals from RF components or equipment.
RF transmitters are electronic devices consisting of an oscillator, modulator, and other circuits that produce an RF signal.
RF receivers are electronic devices that enable a particular radio signal to be separated from all others being received and converted into a format for video, voice, or data.
Inductive electrical and electronic couplings are used in the non-contact transmission of electrical power or electronic signals through stationary, rotating, or moving equipment via an inductive connection.
Product Announcements
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Cellotape, Inc. manufactures custom Radio Frequency Identification (RFID) products to match your specifications...
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RFID, Inc.'s Extend-a-Read product is based on 433 MHz active (battery powered) anti-collision (read many simultaneously) Tags and a single Reader with whip Antenna thus not necessitating any further...
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The average diabetic will prick his finger more than a quarter million times in a lifetime! It is estimated that more than 230 million people are living with diabetes globally – with this number...
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The average diabetic will prick his finger more than a quarter million times in a lifetime! It is estimated that more than 230 million people are living with diabetes globally – with this number...
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Radio Frequency Identification is used for automatic data capture allowing contactless identification of goods using RF to replace barcode labelling. It's key instrument for ensuring more efficiency...
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Radio Frequency Identification (RFID) technology permits wireless, two-way communication between a smart label or tag and a reader. The core of the technology is the "transponder", usually made of...
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RFID Inc. Extend-a-Read2 Next Generation Release of Active Tag RTF Systems for Asset Applications...
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Datamax – a Solution Provider Subscriber to EPCglobal – has taken the concept of RFID and smart labels and made it so user friendly, so dynamic and so robust that a revolution has been...
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The MLX12115 is an ISO compliant 13.56MHz RFID transceiver IC. This low power consumption device supports portable and fixed reader designs requiring a tight footprint. The IC minimizes onboard power...
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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...
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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...
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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...
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A passive RFID tag contains an RFID integrated circuit (IC), resonant capacitor (C), and antenna (L), as shown in Figure 1. The antenna and capacitor form a parallel LC resonant circuit. The LC...
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The RFID- Handbook contains all information about RFID, Radio Frequency Identification, Transponder, RFID Tag, RFID Reader, 14443, 15693, 18000, GTAG, EPC, Antenna, ...
Because RFID systems generate...
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Technical Articles
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