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RFID (radio frequency identification) is a technology similar in theory to bar code identification. With RFID, the electromagnetic or electrostatic coupling in the RF portion of the electromagnetic spectrum is used to transmit signals. An RFID system consists of an antenna and a transceiver, which read the radio frequency and transfer the information to a processing device, and a transponder, or tag, which is an integrated circuit containing the RF circuitry and information to be transmitted.

The RFID device serves the same purpose as a bar code or a magnetic strip on the back of a credit card or ATM card; it provides a unique identifier for that object. And, just as a bar code or magnetic strip must be scanned to get the information, the RFID device must be scanned to retrieve the identifying information.

One of the key differences between RFID and bar code technology is RFID eliminates the need for line-of-sight reading that bar coding depends on. Also, RFID scanning can be done at greater distances than bar code scanning. High frequency RFID systems (850 MHz to 950 MHz and 2.4 GHz to 2.5 GHz) offer transmission ranges of more than 90 feet, although wavelengths in the 2.4 GHz range are absorbed by water (the human body) and therefore has limitations.

A RFID system has three parts

Sample RFID  

RFID Tags: RFID tags are small programmable devices used for tracking. RFID tags come in different shapes, sizes and functionalities.some tags are read-only devices; others are reprogrammable and capable of storing larger amounts of data. RFID tags communicate wirelessly with RFID readers.

 

RFID readers read and sometimes rewrite information stored on RFID tags that come within operating range (a few inches up to several feet). Readers are usually connected to a computer system that records and formats the acquired information for further uses.

 

Computer Database: RFID databases vary widely depending on the intended future use of the logged information. Databases are usually designed in such a way that the information can be easily matched and merged with other information, a technique called computer matching.

RFID Summary features (Presentation - Power Point) describes the work on the RFID chip.

Our RFID White Paper describes in detail the technology development involved.

RFID Data Sheet is the latest description of our RFID IC.

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