Research

At Echoic Engineering, we actively engaged in a number of innovative RF research areas.  Check out our Technical White Papers for more info on our areas of interest.  For inquires on collaboration or development on these topics, please contact us.  

White Papers

Title	Author	Date
Innovating Ultra-Wideband HF-VHF-UHF Beamforming Antennas for Stealth Naval Use	Kelvin Yuk	Oct 2021
Insights on GaN in Millimeter Wave 5G Front-end Modules	Kelvin Yuk	Feb 2021
High Efficiency GaN Power Amplifier Design for Particle Accelerators	Kelvin Yuk	Nov 2020
Perspectives on Through-Wall Radar Imaging	Kelvin Yuk	Oct 2020

  We value the importance of producing cutting-edge research to push the boundaries of what’s possible.  Our peer-reviewed publications have been cited more than 300 times on Google Scholar and read more than 12000 times on ResearchGate.  

Publications

Title	Author	Date
A compact 100W, 68% Class F GaN Power Amplifier for L-band GPS	Hemin Wu, Kelvin Yuk, G. R. Branner	Apr 2019
Radiation Patterns of an RF Energy Harvesting Necklace on Human Body Phantom	Son H. Nguyen, Kelvin Yuk, Rajeevan Amirtharajah, G. R Branner	Jul 2018
A High Power Inverse Class-F GaN Amplifier for L-band GPS Applications	Can Cui, Kelvin Yuk, Hemin Wu, G.R. Branner	Apr 2018
High Power Class F GaN HEMT Power Amplifier in L band for Global Positioning Systems Application	Hemin Wu, Kelvin Yuk, Can Cui, G.R. Branner	Apr 2018
Pulse Skipping Modulation Method for Multiple Input Buck Boost Converter	Son H. Nguyen, Kelvin Yuk, Rajeevan Amirtharajah	Apr 2018
Future Directions for GaN in 5G and Satellite Communications	Kelvin Yuk, G. R. Branner, Can Cui	Aug 2017
Design of a High Power, Wideband Power Amplifier Using AlGaN-GaN HEMT	J. Tan, K. S. Yuk, G.R. Branner	Apr 2017
High power, wideband frequency doubler design using AlGaN/GaN HEMTs and filtering	Claudia Wong, Kelvin Yuk, G. R. Branner, Syed Reza Bahadur	Oct 2011
Advances in Active Microwave Frequency Multipliers	Kelvin Yuk, G. R. Branner	Aug 2011
Design of a High Power X-Band Frequency Tripler Using a AlGaN/GaN HEMT Device	Kelvin Yuk, Claudia Wong, G. R. Branner	Sep 2010
High Power, High Conversion Gain Frequency Doublers Using SiC MESFETs and AlGaN/GaN HEMTs	Kelvin Yuk, G.R. Branner, Claudia Wong	May 2010
A Wideband Multiharmonic Empirical Large-Signal Model for High-Power GaN HEMTs With Self-Heating and Charge-Trapping Effects	Kelvin S. Yuk, George R. Branner, David J. McQuate	Dec 2009
An Improved Empirical Large-Signal Model for High-Power GaN HEMTs Including Self-Heating and Charge-Trapping Effects	Kelvin Yuk, G. R. Branner and David McQuate	Jun 2009
An Empirical Large-Signal Model for SiC MESFETs with Self-Heating Thermal Model	Kelvin Yuk, G.R. Branner	Nov 2008
A Simplified, Empirical Large-Signal Model for SiC MESFETs	Kelvin Yuk, G.R. Branner	Oct 2007