The Radio Assay: Josh Griffin kicked off the microwave backscatter research with his famous “Radio Assay” — custom hardware that could measure link degradations experience by RFID tag antennas when placed upon card- board, wood, metal, etc. In 2004, Josh Griffin began the first of many UHF/microwave backscatter experiments involving the “Radio Assay” of an antenna. The radio assay was a series of tests involving antennas radiating against different types of materials: cardboard, wood, water containers, plastic, meat, and metal.
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This lecture presents the concept of multi-antenna backscatter signaling with multiple reader and tag antennas. The key paper for review is Josh Griffin’s ground-breaking work on MIMO signaling with backscatter tags. We also discuss the interesting small-scale fading
