MTT/AP Chapter Technical Meeting: Microwave Windows and Absorbers

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This talk will present multi-pole tunable frequency selective surface (FSS) filters and absorbers based on admittance inverter interlayers and plasma shells. Recently, we have successfully designed and validated two-pole and three-pole bandpass FSS filters with maximally flat inband responses while placing the adjacent resonant FSS layers at less than λ/20 distance apart. The separation between the FSS layers can be arbitrary, thus providing flexible design control of both passband response and overall filter thickness. If low profile is desired, FSS layer may be placed at a very close proximity. But if structural rigidity is required, FSS layers can also be placed at a moderate distance apart without sacrificing filter response. Given arbitrary spacing between the FSS layers, inter-coupling layer can be tuned to deliver desirable filter response. Furthermore, thickness customizable multi-layered FSS filters and absorbers allow simpler integration of tuning elements. In our work, plasma shells (hollow gas encapsulating structures) are used to tune the FSS filters and absorbers. When the voltage is applied across the shells the gas contained inside shells ionizes and forms plasma. Recently we have demonstrated a switchable FSS bandpass filters by integrating plasma-shells into two-pole FSS filters based on inverter interlayers. Building onto our initial results, we are currently working on realizing tunable multi-layered Jaumann absorber using electronically tunable plasma-shells.



  Date and Time

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  • Rochester Institute of Technology
  • 1 Lomb Memorial Drive
  • Rochester, New York
  • United States 14623
  • Building: GLE
  • Room Number: 2580 - Xerox Auditorium
  • Click here for Map
  • Co-sponsored by Jayanti Venkataraman
  • Starts 01 February 2019 09:14 AM
  • Ends 08 February 2019 12:10 PM
  • All times are America/New_York
  • No Admission Charge
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  Speakers

Dr. Jun (Brandon) Choi
Dr. Jun (Brandon) Choi of University of Buffalo, SUNY

Topic:

Microwave Windows and Absorbers

This talk will present multi-pole tunable frequency selective surface (FSS) filters and absorbers based on admittance inverter interlayers and plasma shells. Recently, we have successfully designed and validated two-pole and three-pole bandpass FSS filters with maximally flat inband responses while placing the adjacent resonant FSS layers at less than λ/20 distance apart. The separation between the FSS layers can be arbitrary, thus providing flexible design control of both passband response and overall filter thickness. If low profile is desired, FSS layer may be placed at a very close proximity. But if structural rigidity is required, FSS layers can also be placed at a moderate distance apart without sacrificing filter response. Given arbitrary spacing between the FSS layers, inter-coupling layer can be tuned to deliver desirable filter response. Furthermore, thickness customizable multi-layered FSS filters and absorbers allow simpler integration of tuning elements. In our work, plasma shells (hollow gas encapsulating structures) are used to tune the FSS filters and absorbers. When the voltage is applied across the shells the gas contained inside shells ionizes and forms plasma. Recently we have demonstrated a switchable FSS bandpass filters by integrating plasma-shells into two-pole FSS filters based on inverter interlayers. Building onto our initial results, we are currently working on realizing tunable multi-layered Jaumann absorber using electronically tunable plasma-shells.

Biography:

Jun (Brandon) Choi received Ph.D. degree in Electrical Engineering at the University of California, Los Angeles, in 2014. From 2014 to 2017, he was an Assistant Professor with the Department of Electrical Engineering and Computer Science at Syracuse University, NY, where he is currently an Assistant Research Professor. He is also an Assistant Professor with the Department of Electrical Engineering at the University at Buffalo, NY. His research interests are in the areas of applied electromagnetics and microwave engineering. In particular, dispersion engineering, periodic structure analysis, and antenna/array theory have been extensively applied throughout his research works in developing novel microwave devices and systems

Email:

Address:230 K Davis Hall, , Buffalo, New York, United States, 14260





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