A broadband modulated scattering technique (MST) probe based on a self complementary antenna

This work presents the design of a broadband modulated scattering technique (MST) probe. The MST probe works in the whole X band 8-12 GHz and achieves an operative range of about 15 meters with a limited amount of power. The communication between the reader and the tag is obtained using the standard EM4102 RFID protocol to keep the compatibility with existing RFID systems. The information is carried on by modulating the load of the antenna tag with a suitable electronic switch circuit. The antenna tag, a broadband self-complementary antenna and the electronic switch have been optimized to reach the maximum operative range. A tag prototype has been designed, fabricated and experimentally assessed. The obtained experimental results are quite promising.