Abstract
A novel design of a long range semi-active radio frequency identifier (RFID) tag based on the modulated scattering technique (MST) is presented in this paper. The tag system works at 9.75 GHz and achieves a reading distance about 10 m in a transmitted power of 200 mW. The tag chip obtains the temperature data from the sensor and scatters them to the reader. The communication between the reader and the tag is accorded with EM4102 RFID protocol, and the data are modulated by a diode switch circuit. The tag prototype has been designed, fabricated, and experimentally evaluated. The achieved results can provide reference for the design of high frequency RFID tags.
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