David PorterfieldOur founder and CEO, David Porterfield, has over twenty-five years of experience designing millimeter- and submillimeter-wave components and systems. At Virginia Diodes he led the effort to develop high-efficiency and high-power varactor multipliers operating in the band from 30 GHz to 800 GHz. He developed a full line of broadband frequency doublers covering the standard waveguide bands from WR-22 to WR-1.9 (33-600 GHz) and a line of frequency quadruplers. David developed a novel design for varactor frequency triplers operating at frequencies from 90 GHz to 750 GHz where the second harmonic idler is implemented in a way that makes it easy to bias and assemble the tripler. He has developed a line of hybrid-mode frequency multipliers that exhibit high efficiencies approaching those of varactors but with improved bandwidth.

David has served as the primary investigator on numerous SBIR contracts with NASA and the US Army Research Office for the development of terahertz receivers for atmospheric remote sensing, for the development of millimeter-wave Gunn oscillator replacement technology, and the development of terahertz transmitters. He served as the principal investigator on a NASA Phase II SBIR for the development of high-frequency ferrite components, and has authored over thirty technical papers.

He currently owns and operates Micro Harmonics Corporation. His areas of expertise include microwave and millimeter-wave component and system design, high frequency linear and nonlinear electromagnetic simulation and design, gallium-arsenide diode technology and ferrite component design. His education includes:

  • University of Virginia, 1998 – Ph.D. Electrical Engineering
  • University of Virginia, 1993 – M.S. Electrical Engineering
  • Georgia Tech, 1989 – Bachelor of Electrical Engineering

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Diane has been doing research in the area of ferrite devices in millimeter-wave applications since 2013. She received the MEng (EE) from the University of Virginia in 2014 with a focus of study in microwave engineering. In her last year of graduate study, she wrote two literature reviews titled “Faraday-Rotation Isolators in Microwave Circuits” and “Waveguide Y-Junction Ferrite Microwave Circulators”. Her final semester was spent working on the design of a W-band Faraday-rotation isolator.

Diane joined Micro Harmonics in 2015 and served as senior microwave engineer on a highly successful NASA SBIR developing high-frequency (50-325 GHz) ferrite components. She has been instrumental in helping Micro Harmonics take these products to the commercial market.

Diane also has industry experience in process automation, project engineering, and plant engineering at Borg Warner Chemicals in Morgantown, West Virginia, and Sumitomo Electric, fiber optic cable manufacturer in Research Triangle Park, North Carolina. Prior to joining Micro Harmonics Corporation Diane was an instructor in the engineering transfer program at Virginia Western Community College. Her education includes:

  • University of Virginia, 2014 – MEng. Electrical Engineering
  • West Virginia University, 1982 – BS Electrical Engineering
  • University of North Carolina at Chapel Hill, 1988 (18 hours towards MS, Mathematics)

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Aaron Kees joined our team as the Director of Finance in 2021. He brought with him more than a decade of experience in the world of corporate accounting and finance. A graduate of Virginia Tech, he came to Micro Harmonics from KPMG where he guided multinational and Fortune 500 companies through SEC filings, initial public offerings, mergers and acquisitions, reorganizations, as well as other corporate audits. He also spent time serving as a national instructor for KPMG audit curriculums.

His education includes:

  • Virginia Polytechnic Institute and State University, 2011 – B.S. Accounting and Information Systems
  • Virginia Polytechnic Institute and State University, 2011 – Certificate of Additional Major in Finance

He is licensed as a Certified Public Accountant in Virginia (2012) and North Carolina (2018).

Aaron Kees on Linked-In


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