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- S. Chaimool, C. Rakluea, P. Akkaraekthalin, and Y. Zhao, “Irregular metasurfaces for mid-range wireless power transfer systems,” The 2019 Asian Workshop on Antennas and Propagation (AWAP2019), April 24-25, 2019, Seoul, Korea.
- C. Rakluea, S. Chaimool, Y. Zhao, and P. Akkaraekthalin, “Compact non-uniform metasurface for efficiency enhancement of planar wireless power transfer,” The 2019 International Electrical Engineering Congress (iEECON2019), March 6-8, 2019, Cha-am, Thailand.
- Y. Zhao, and S. Chaimool, “Analysis of high-speed moving metamaterials using the Lorentz-FDTD method,” The 40th Progress In Electromagnetics Research Symposium (PIERS2018), August 1-4, 2018, Toyama, Japan.
- T. Hongnara, S. Chaimool, P. Akkaraekthalin, and Y. Zhao, “Beam-steering antenna design using uniform square ring-based metasurface,” The 14th Annual International Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology Conference (ECTI-CON 2018), July 18-21, 2018, Chiang Rai, Thailand.
- C. Rakluea, S. Chaimool, Y. Zhao, and P. Akkaraekthalin, “Compact size printed spiral coil resonator-loaded loop for magnetically resonant coupled wireless power transfer system,”, 2018 Thailand-Japan Microwave (TJMW2018), June 27-29, 2018, Bangkok, Thailand.
- E. Khansalee, and Y. Zhao, “Design and implementation of class-E power amplifier with parallel circuit for wireless power transfer systems,” The 2017 International Electrical Engineering Congress (iEECON2017), March 8-10, 2017, Pattaya, Thailand.
- E. Khansalee, Y. Zhao, and L. Wuttisittikulkij, “Design of a dual-band rectifier for wireless energy harvesting,” The 30th International Technical Conference on Circuits/Systems, Computers and Communications (ITC-CSCC 2015), June 29 – July 2, 2015, Seoul, Korea.
- Y. Zhao, “Directivity enhancement using hyperbolic metasurfaces,” The 2015 Asian Workshop on Antennas and Propagation (AWAP2015), June 17-18, 2015, Bangkok, Thailand.