Section One


What is RFID?

Radio frequency identification (RFID) is a generic term describing a system that uses radio waves to identify an object or person. There are three fundamental components in a passive RFID system: a passive RFID tag, an RFID reader, and a database. A passive RFID tag is a battery-less device that consists of a radio antenna attached to a microchip which stores a unique identifier (i.e. a unique number). An RFID reader is a device equipped with one or more antennas that emit radio waves and receive signals back from nearby passive RFID tags. Specifically, an RFID reader’s antenna emits radio waves that energize one or more passive RFID tag(s) in front of that antenna; that energy is in turn used by those tag(s) to send their unique identifier(s) back to the antenna. Finally, a database in an RFID system contains a table that maps tag identifiers to information about the tagged items. The database also contains the list of all tags detected by antennas and the time when they were detected.

The following components are required to write data (encode) to class 1 tags:

Software Application > Encoder Software > Tag Encoder > RFID Tag

The following components are required to read data from the tag:

RFID Tag > Reader, Interrogator or Access Point > Decoding Software > Software Application

Fongwah technology provides some components of this system including Software Applications, Encoder Software and tag/IC card reader & Writers,contactless reader writer, S9,E7 reader.


Why should I use a different frequency?

There are four kinds of frequency bands, low frequency (125KHz) In operation, the high frequency (13.54MHz), UHF (850-910MFz), microwave (2.45GHz). Each has its frequency characteristic is used in different areas, therefore we must first choose the correct use of the appropriate frequency.

LF, HF, UHF are what represent?

And we listen to the radio for the same reason, RFID tags and readers have the same frequency modulation to work. LF, HF, UHF corresponding to different frequencies on a radio frequency. LF low frequency radio representatives, at around 125KHz, HF high frequency radio representatives, about 13.54MHz, UHF behalf UHF radio, in the 850 to 910MHz range.


What is the effective range of the reader is receiving radio waves?

Reception range of the reader is affected by many factors, wave frequency, size and shape labels, energy reader, interference metal objects, and other RF devices. Overall, the reception from the low-frequency passive tags within a foot for high-frequency passive tags receiving distance of about three feet, for the reception of UHF tags in the ten to twenty feet away. For the use of semi-active and active battery tags, readers can receive three hundred feet or even farther signal. For low-frequency and high-frequency radio, if the size tag and reader antennas as receiving distance can be calculated by multiplying 1.4 diameter antenna. In less than thirty centimeters in diameter, this rule will apply.