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RFID Coil Design

From Microchip Technology, Inc.
 

 
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 signal can be radiated effectively if the linear dimension of the antenna is comparable with the wavelength of the operating frequency. In an RFID application utilizing the VLF (100 kHz ? 500 kHz) band, the wavelength of the operating frequency is a few kilometers (l = 2.4 Km for 125 kHz signal). Because of its long wavelength, a true antenna can never be formed in a limited space of the device. Alternatively, a small loop antenna coil that is resonating at the frequency of the interest (i.e., 125 kHz) is used. This type of antenna utilizes near field magnetic induction coupling between transmitting and receiving antenna coils.
Products & Services
RF transceivers are electronic devices that receive and demodulate an RF signal, then modulate and transmit a new signal. Search by Specification | Learn more about RF Transceivers
Product Announcements
RFID, Inc. - 32 RFID Readers linked to a Single Interface
Smart Antennas - Network up to 32 RFID Readers to a single PLC I/O board/port. Smart Antenna RFID products offering DeviceNet, Ethernet/IP, standard Ethernet, and Profibus protocols from RFID... (read more)
Automated Assembly Corporation - RFID Tags Assembly
Automated Assembly Corporation is the first and only company in the World to manufacture RFID Processing roll to roll and assemble RFID tags with soldered inner connects. They have been developing... (read more)
Datamax-O'Neil - RFID Printers
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... (read more)
Melexis, Inc. - New 300-to-930-MHz RF Receiver Family
The MLX71120 and MLX71121 are two new members of a highly integrated RF receiver family. Both automotive-qualified ICs with dual RF inputs have been specifically designed for low cost antenna... (read more)
Indesign, LLC. - RF/Wireless Design
Indesign offers an RF circuit design team with extensive design experience in a variety of wireless technologies. Whether your product requires a standards-based wireless feature, such as ZigBee, or a... (read more)
RFID, Inc. - R³-2 - RFID Rough Tough Versatile Hardware
This 2nd generation 125 KHz product is based on the same rugged proven technology as that of our R3 (R cubed) family of RFID solutions with some enhancements. Utilizing dozens of tag styles, smaller... (read more)
RFID, Inc. - Active Tag RTF Systems for Asset Applications
RFID Inc. Extend-a-Read2 Next Generation Release of Active Tag RTF Systems for Asset Applications... (read more)
 
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)
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... (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)
4.10 Exercises RFID configurations: 4.1. How many antennas are used simultaneously for transmit and receive functions in a monostatic RFID reader? ________ 4.2. A bistatic antenna... (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)
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