Graduate Seminar with Subhanwit Roy: Low-Cost Portable Readout System Design for Inductively Coupled RF Resonant Sensors


October 26, 2022    
1:10 pm - 2:00 pm


3043 ECpE Bldg Addition
2520 Osborn Dr, Coover Hall, Ames

Event Type

Title: Low-Cost Portable Readout System Design for Inductively Coupled RF Resonant Sensors

Abstract: As our world undergoes the fourth industrial revolution (Industry 4.0), fueled by the growth and adoption of smart technologies, there has been a rapid increase in the demand for low-cost, wireless, real-time sensing systems. Spiral coil-based LC resonant sensors have emerged as an attractive solution owing to their passive nature and low fabrication cost, and have seen many applications in agriculture, healthcare, biomanufacturing, and consumer electronics. Traditional techniques to interrogate such sensors using vector network analyzers are expensive and often not portable, whereas custom readouts suffer from either high cost, low range of usable interrogation distances between the readout and the sensor, or low frequency range.

This talk will discuss the development of a new simple, low-cost, and portable readout design platform based on the technique of coherent demodulation. The underlying theory will be briefly discussed, and measurement results of a complete readout system, implemented using printed circuit board technology and commercially available off-the-shelf components, will be presented. The fabricated system can operate reliably and repeatably over a wide frequency range of 1-100 MHz, and interrogation distances up to 5 cm.


Bio: Subhanwit Roy received his Bachelor of Technology degree in Electronics and Communication Engineering from National Institute of Technology – Durgapur, India, in 2015 and his M.S. degree in Electrical Engineering from Iowa State University, Ames, in 2017. Since 2018, he has been pursuing his Ph.D. at Iowa State University. His research interests lie in RF circuit design for next-generation wireless sensing and communication technologies, and engineering education. In 2022, Subhanwit worked as an RF engineering co-op with the 5G/LTE power amplifier design team of Skyworks Solutions, Cedar Rapids. He is also currently working with Skroot Laboratories, Inc., a startup based in ISU Research Park, to adapt his Ph.D. research for a commercial application. He is a fellow of the Iowa State University Preparing Future Faculty program and an active graduate student member of the Institute of Electrical and Electronics Engineers (IEEE) and the American Society for Engineering Education (ASEE).

Advisor: Dr. Nathan M. Neihart

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