Micro Harmonics specializes in ferrite based millimeter-wave and sub-millimeter-wave components. The company was founded in 2008 as a specialized research and design consultancy for microwave, millimeter-wave and sub-millimeter-wave components and systems. In 2015 we were awarded a NASA Phase I SBIR to develop an advanced line of Faraday rotation isolators and circulators in bands from WR-15 through WR-3 (50 to 320 GHz). NASA extended that program to a Phase II grant that ends in April 2018.
To date we have demonstrated working isolators in WR-12, WR-10 and WR-8 and will soon have prototypes at WR-6.5 and WR-5.1. Using sophisticated impedance matching and mode control techniques we have demonstrated a WR-15 circulator with more than seven GHz bandwidth from 57-64 GHz (three times the bandwidth of any commercial product). We have completed the design of a WR-10 circulator with over 6 GHz bandwidth near 94 GHz. Circulators and isolators in the other bands are in design and assembly stage. Our goal is to develop a full line of commercial ferrite components operating from 50 GHz to 320 GHz with significantly improved performance over the current state-of-the-art.
David W. Porterfield, Jr.
CEO / CTO
David 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 is currently serving as the principle 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.
University of Virginia Ph.D., Electrical Engineering 1994-1998
University of Virginia M.S., Electrical Engineering 1990-1993
Diane P. Kees received the MEng (EE) from the University of Virginia in 2014 and the BSEE with highest honors from West Virginia University in 1982. Her focus of study was microwave engineering. Her last year was spent studying the use of ferrites in microwave devices. She wrote two literature reviews: 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.
She also completed one year of graduate school in mathematics at the University of North Carolina in Chapel Hill before moving to Roanoke, Virginia where she was an instructor in the engineering transfer program at Virginia Western Community College.
University of Virginia MEng, Electrical Engineering 2009-2014
University of North Carolina at Chapel Hill 18 hours towards MS, Mathematics 1987-1988
West Virginia University BS, Electrical Engineering 1978-1982
Ken Conklin is the former general manager of a major producer of gallium arsenide (GaAs) microwave monolithic circuits, a former M/A-COM and then Cobham Defense Systems business unit. Direct reports included directors of operations, engineering, quality, program management, and human resources. As general manager, he directed the profit and loss of the organization, budgeting, customer development and strategic planning. Ken also led the relocation of the facility from its campus in Roanoke, Virginia to a new modern facility in Blacksburg, VA.
Prior to joining Cobham Ken held business development related roles with Hughes Aircraft, IBM and RFMD. His experience includes introducing new products for defense, space, and commercial applications including those for advanced radar systems, military space programs, and navigation systems enabled by GPS. While at Hughes Aircraft he managed business development activities for the Millimeter-Wave products group which pioneered the introduction of standard products designed specifically for applications operating in the millimeter-wave frequency bands.
Northrop University B.S. Electronic Engineering 1970 - 1974
The Anderson School (UCLA) Certification, Executive Marketing 1990
Micro Harmonics looks forward to consistently growing and improving our catalogue of submillimeter wave system components. Technicians are dedicated to evolving the assembly process so as to provide products that continue to exceed industry standards.
Micro Harmonics is a small business producing technology and research for some of the most innovative and emerging companies in the technology, research, and space sectors.