Full Name:                 Lixin Guo (L. X. Guo)

       Date of Birth:             Sep. 16, 1968

       Place of Birth:            Xi’an, Shaanxi, China

       Affiliation:                 

         Xidian University, School of Physics，

         Box 274, South Taibai Road 2, Xi’an, China

       Phone and Fax:         

                               +86-29-88201450 (office);

       E-mail:           

                               lxguo@xidian.edu.cn 

                            lxguo@mail.xidian.edu.cn

Radio Wave Propagation:

Radio wave propagation is a branch of electronics that studies the interaction between radio waves and media, clarifies their physical mechanisms, and provides theoretical supports for engineering schemes, optimal working conditions selection, and propagation error correction of electronic system. When radio waves propagate at the interface of a medium or in a medium, their reflection, scattering, refraction, diffraction, and absorption can cause changes in the amplitude, phase, polarization, propagation direction, and other parameters. The media involved in radio wave propagation include the Earth (surface of the Earth, etc.), the Earth's atmosphere (ionosphere, etc.), and artificially generated media (plasma generated during re-entry of aircraft into the atmosphere, etc.). The characteristics of these media vary randomly over time and space, so the research on the relationship between media and radio wave propagation has always been a highly challenging work in the world. To coordinate and promote the development of radio wave propagation, specialized research organizations have been established internationally. For example, the third research group on “Radio Wave Propagation” set up by the International Telecommunication Union-Radiocommunication Sector (ITU-R), the F committee on “Remote Sensing and Wave Propagation” and The G committee on “Ionospheric Radio and Propagation” set by the Union Radio-Scientifique Internationale (URSI). The Xidian University, where Lixin Guo works, is an important member of the research group and committees mentioned above. He is the head of the Radio Wave Propagation Committee in Xidian university.

Prof. Guo focuses on the study of propagation mechanisms of radio wave in physical channels in urban space, near space, and ionospheric space. He is one of the pioneer researchers on radio wave propagation in complex environments in China. The Ray Tracing method (RT) combined with Finite Difference Time Domain method (FDTD) proposed by Prof. Guo, revealed the coupling mechanism of radio waves and urban environment in terms of time, space, frequency, energy, and polarization, which providing a reliable theoretical basis for 3G, 4G, 5G, and 6G wireless communication network planning and optimization in urban environments (this achievement has been included in the world’s first “Electromagnetic Information Theory White Paper”). Prof. Guo is the first scholar in China to combine hydrodynamics with computational electromagnetics to study the propagation of radio waves in near-space. Based on the fractal characteristics of dynamic flow fields, he established a stochastic model for the electromagnetic characteristics of hypersonic flow fields, which providing a feasible new approach for analyzing the random fluctuations of communication signals during aircraft re-entry. Prof. Guo has built China’s first Radio Wave Observation Station located in a university. He established heating models of the D, E, and F layers of the ionosphere, and proposed serval methods to study the structural characteristics of ionospheric non-uniformity. This is of great significance for the application and scientific research of radio waves in satellite communication, Over-the-horizon Radar (OTHR) system communication, and ionospheric scattering communication, etc. He has already published 260+ journal papers in the field of radio wave propagation, including 60+ IEEE journal papers.

Computational Electromagnetics in Rough Surface Scattering:

The non-imaging remote sensing radar mainly obtains information (such as ground height fluctuation, moisture content, wind speed of sea surface, etc.) by measuring the electromagnetic (EM) scattering coefficient of the rough surface. Due to the randomness of rough surface and the complexity of its interaction with targets, there are many unresolved challenges in this field. Mainly including: (1) incomplete geometric modeling methods for natural environments, (2) The low efficiency of numerical algorithms (FDTD, MoM, FEM) for EM scattering from 3-D dynamic sea surface under low grazing incidence, (3) the simulation of composite EM scattering from multiple electrically large targets in rough surfaces has not been solved. Prof. Guo focuses on the research of computational electromagnetic algorithms in composite electromagnetic scattering between rough surfaces and targets. He has proposed a series of computational electromagnetic simulation algorithms specifically for scattering problems under high roughness and low grazing incidence. He is one of the earliest researchers in China to analyze the mechanism of composite scattering between rough surfaces and targets.

Prof. Guo proposed an improved time varying fractal Pierson Moskowitz model (TVF-PM), which solves the defect of fractal theory being able to only describe the negative power-law part of actual sea spectra. He also proposed an extended boundary condition method (EBCM) which provides a feasible new method for EM modeling of sea clutter. Prof. Guo designed a general parallel scheme for computational electromagnetic methods, which improved the computational efficiency of FDTD, MoM, FEM and RT by 80-100 times. Thus, it enabled us solved the difficulty of composite EM scattering from large-scale sea surfaces and targets at low grazing angles efficiently. He also proposed a new hybrid algorithm combining forward backward method (FBM) and extended propagation inside layer expansion method (EPILE), which solves the problem of composite scattering when multiple targets exist above and below rough surfaces. He has published a book entitled “Basic Theory and Methods of Random Rough Surface Scattering” (Science Press), which is the first one of China in the field of computational electromagnetics in rough surface scattering. He has developed the first composite EM scattering software for rough surfaces and targets, which has become the standard in China. Then, Prof. Guo updated the software periodically and deployed it in over 20 companies and research institutes, such as Beijing Institute of Environmental Features and Xi'an Institute of Electromechanical Information Technology, generating direct economic benefits of over 400 thousand US dollars annually. He has published 300+ journals papers in this field of computational electromagnetics in rough surface scattering, including 60+ IEEE journal papers. Due to the outstanding contributions, he was awarded the National Outstanding Youth Fund (selected by the State Council, Top high-end young talents in China), and Cheung-Kong Professor (selected by the Ministry of Education of China, only 1-2 persons in antennas and propagation per year).

Service to the General Antennas and Propagation Community:

Prof. Guo is one of the scholars who supervised the most graduate students and PhD students in the field of antennas and propagation in China. He has taught 145 graduate students and supervised 50 PhD students. Three doctors won the Shaanxi Provincial Excellent Doctoral Dissertation Award (selected by Shaanxi Province, only 1 person in the field of antennas and propagation per year).

He was elected the Chinese Institute of Electronics (CIE) Fellow, and vice chair of special committee on EM scattering and inverse scattering of Antenna Society of CIE (only 3 Vice Chairmen out of 1000+ researchers).

He is currently leading (as the workshop chairman and organizer) the International Workshop on Optoelectronic Perception to contribute significantly to the antennas and propagation community. Furthermore, he has worked as Advisory Committee Chairs, TPC Chairs, Session Chairs, TPC Members in academic conferences for 65 times. He serves as a reviewer for IEEE Trans. AP, IEEE Trans. GRS, IEEE Trans. MTT, IEEE JSTARS, proceedings of the IEEE, IEEE AWPL, IEEE MWCL.

He has been promoting many international collaborations with Duke University, University of Maryland, University of Kent, University of Rouen, The University of New South Wales, Bar-Ilan University, University College London, University of the Witwatersrand, University of Michigan, The Chinese University of Hong Kong etc..

Professor Guo has been enlisted in the “World’s Top 2% Scientists”, and included in the “World’s Top 2% Scientists” for two consecutive years (2022 and 2023) based on the Elsevier Data Repository prepared by Prof. John P.A. Loannidis and his team at Stanford University.