Invited Talk: Xiangru Wang, University of Electronic Science and Technology of China

Special session 10: Advanced Electromagnetic Materials for Millimeter-Wave and THz Applications

Short Bio: 
He graduated from the University of Electronic Science and Technology of China (UESTC) in 2006. and obtained a PhD in optics in 2012, From 2009 to 2011, he worked at the US Top3 optical center CREOL University of Central Florida as Visiting Research Scientist. During the scientific research work in the United States, he participated as the main researcher in the US Department of Defense’s DARPA and JTO projects "High Power Laser Beam Combining Technology", "Large Mode Field High Power Fiber Laser Technology" and other major US defense projects, achieving 400 for the first time in the world. After joining in the UESTC in 2012, he has been principle investigator of the PHI group and a number of national, provincial and ministerial projects such as 863, and the National Natural Science Foundation of China, and took the lead in breaking through the key technology of optical phased array rapid response in microseconds. In recent years, he has published more than 40 papers indexed by SCI and EI and nearly 20 academic speaks, and obtained more than 20 patents. Research interests include: "Liquid crystal Microwave Phased Array Technology", "Satellite Interconnection Network Technology", "Wireless Energy Transmission Technology", "Satellite-to-ground Energy Transmission Technology", "Broad Spectrum Dielectric Control Technology" and other microwave/laser cutting-edge technologies. He is currently a member of IEEE and OSA, as well as a special reviewer for Optics Letters, J. Soc. Am. B, Applied Physics: B, J. Quan. Elect. and other internationally well known journals.

Title:  Reconfigurable Microwave Phase Shifter Based on Nematic Liquid Crystal: Design and Experimental Validation

Abstract:
In this paper, a low-cost microstrip line structure microwave phase shifter based on nematic liquid crystal materials is discussed.The device is built on a glass substrate: the two ports of this device have the coplanar waveguides (CPWs) with 50Ω impedance structure to feed the energies or extract signals at both ends of the phase shifter. The simulation validate the phase shift can reach 360 degrees, and the S21 parameter reaches -4.5dB in the frequency band 28-30Ghz.The practical device shows S21 insertion loss is -12~-15dB, the phase shift can reach 360 degrees, and it works well between +10℃~+65℃.The phase-shifting repetition accuracy is less than 1 degree.