Test your knowledge of electrostatics with classic night-vision/IR goggles.
Solution: [Read more…]
Mohammad Alhassoun Wins Best Paper Award at IEEE RFID 2018
ECE PhD student Mohammad Alhassoun, along with co-authors Michael Varner and Prof. Gregory D. Durgin, has won the Best Paper Award at the IEEE International Conference on RFID 2018. Held from April 10-12 in Orlando, Florida, IEEE RFID 2018 is the world’s premier science and engineering conference for RF identification and related technologies.
Alhassoun’s paper, entitled “Design and Evaluation of a Multi-Modulation Retrodirective RFID Tag”, presented a new type of radio communicator that uses reflected power for communications. Operating much like a corner reflector in optics, Alhassoun’s microwave device reflects incoming radio power back to where it originated, adding bits of information to the signal in the process. The device will enable many low-powered or energy-harvesting radios to communicate over long distances.
Transmission Lines with Pre-existing Charge
In lecture TDT06, we explore how to analyzer a transmission line in a circuit with a pre-existing charge. This material is important in the world of high-speed digital electronics, where logic pins that suddenly switch low or high can propagate peculiar transients on signal lines … even if they are only used to load an initially-charged line.
As a side note, my first preparation of this lecture led to the four basic equivalent circuits for time-domain transmission lines, summarized in the figure on the left. These useful equivalents (specifically the general equivalent circuit) had never, to my knowledge, been reported in a textbook or subject paper before. But the GT students found them particularly useful, especially for working the infamous sequencer problems.
The World’s First Digital Radio System
Gregory D. Durgin, originally posted on WaveRacer.com
18 June 2001
The world’s first digital radio system was actually the world’s first radio system. This article discusses the physics behind Marconi’s revolutionary communications scheme: coherer-based reception of Morse code.
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