2008: Josh Griffin built a custom 5.8 GHz down-converter and demonstrated tag gains at 5.8 GHz when small, multiple tags are modulated jointly. Thus, Griffin modulation was born! Josh Griffin demonstrates how the modulation of two antennas beside … [Continue reading]
Invited Paper on Retrodirective Rat-Race Circuit Now Available on IEEExplore
Theory and Design of a Retrodirective Rat-Race-Based RFID Tag Mohammad Alhassoun, Michael A. Varner, Gregory D. Durgin IEEE Journal of Radio Frequency Identification Year: 2018 The full-length journal paper on Mohammad Alhassoun's rat-race design … [Continue reading]
Low-Powered Microwave Reader for Satellites
Low-power and Compact Microwave RFID Reader for Sensing Applications in Space Cheng Qi, Joshua D. Griffin, Gregory D. Durgin IEEE International Conference on RFID Technology & Application (RFID-TA) Macau SER, Sep 2018, 6 pages Paper from the … [Continue reading]
Scattering and Computer Graphics
In this set of notes, an electromagnetic model of rough surface scattering is presented, with analogies drawn to rendering and shading models in computer graphics. Although this originates in an RF-centric modeling class, the analogy to optics is … [Continue reading]
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