September 27, 2005
Frequencies for active tags
Active RFID tags do not depend upon the reader for power. They have better range and data handling capabilities as compared to passive tags. The correct radio frequency of an active tag is a function of performance, regulations, and other such factors. Currently, 433 MHz is considered to be the ideal frequency for active tags working in a crowded environment. A frequency of 433 MHz has a wavelength of around 1 meter, which allows the signals to move around obstacles. In the presence of limited obstructions, UHF can also be used, particularly if the situation demands high speed reading as in the case of vehicles on the road. UHF and 2.45 GHz tags can be employed to achieve a range of up to 30 meters. These tags are read only (24-bits data).
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