Abstract
This paper seeks to demonstrate the functionality and verify the capabilities of capacitance adjustment by a self-folding device. The self-folding devices using polyvinyl chloride (PVC) shrink wrap and copper foil tapes with predefined creases were fabricated. By modifying a simple self-folding device and exposing it to a temperature between 50 to 90 degrees Celsius, the capacitor plates could be angled from 15 to 90 degrees. As a result, the capacitance changed as the inner angle decreased, from only 0.724 picofarads measured at 90 degrees, to 2.27 picofarads measured at 15 degrees. With the capacitance for each angle obtained, the next phase of development was conducted, to determine the tune-ability using a passive high pass filter. By scaling up the number of self-folding capacitors to thirty times, a cut-off frequency of 4.99 kHz at 15 degrees up to 7.25 kHz at 75 degrees was measured. As a result, this paper’s unique way of turning a self-folding device into a capacitor demonstrates great potential for development of tunable filters using capacitance adjustment and self-folding.
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Paul Chastain received a Bachelor of Science degree in Mechanical Engineering in 2019 from the Georgia Southern University in Statesboro, GA, USA. His current research interests include self-folding technology, soft robotics, and self-driving car technology.
Minchul Shin received the B.S. degree from Kyungpook National University, Daegu, Korea, in 2005, the M.S. degree from University of Alabama at Birmingham, and the Ph.D. degree from the Tufts University in 2012, specializing in Microelectromechanical Systems (MEMS) and Micro/Nano Fabrication. Following his Ph.D, he worked as a postdoctoral fellow at the University of Michigan with a research concentration on thin film micro-robot design. He is currently an Assistant Professor with the Department of Mechanical Engineering at Georgia Southern University, Statesboro, GA. His research interest lies in soft robotics, MEMS design, sound source detection, and micro robotics.
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Chastain, P., Shin, M. Development of tunable filters using self-folding technology. J Mech Sci Technol 33, 1891–1896 (2019). https://doi.org/10.1007/s12206-019-0341-y
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DOI: https://doi.org/10.1007/s12206-019-0341-y