1. high-power vacuum electron amplifier

2. dielectric permittvity and permeability measurement

3. Ultra-short electromagnetic pulse technology and applications 

[1] W. J. Wang, G. Liu, Y. Wang, W. Jiang, Q. Zheng, J. X. Wang, and Y. Luo, "A more accurate measurement method of the dielectric material properties with high tolerance Using an overmoded waveguide," IEEE Transactions on Microwave Theory and Techniques, vol. 70, no. 4, pp. 2363-2369, Apr. 2022.

[2] W. J. Wang, G. Liu, W. Jiang, Y. Pu, J. X. Wang, and Y. Luo, "Design and measurement of a broadband compact TE11 mode input coupler for an X-band gyrotron traveling wave tube," IEEE Transactions on Microwave Theory and Techniques, vol. 68, no. 11, pp. 4554–4559, Nov. 2020.

[3] W. J. Wang, G. Liu, W. Jiang, Z. W. Wu, Y. L. Yao, Y. L. Pu, J. X. Wang, and Y. Luo, "Microwave measurement of a compact circular TE11 mode coupler loaded with ridges," IEEE Transactions on Electron Devices, vol. 68, no. 1, pp. 359–363, Jan. 2021.

[4] W. J. Wang, G. Liu, Yelei Yao, Jianxun Wang and Guo Liu, "An improved waveguide method for accurate complex permittivity measurement of medium/high-loss material", Meas. Sci. Technol. 35, 066005, 2024.

[5] W. J. Wang, G. Liu, Y. J. Cao, B. L. Chen, Y. L. Yao, Y. Wang, X. Q. Gong, W. Jiang, J. X. Wang, and Y. Luo, "Theory and measurement of the single and hybrid-mode excitation and evolution in a lossy-dielectric-loaded waveguide," Journal of Electromagnetic Waves and Applications, 37:4, 510-523, 2023.

[6] G. Liu, W. J. Wang, W. Jiang, Y. L. Yao, J. X. Wang, and Y. Luo, "Theory, simulation and millimeterwave measurement of the operating and parasitic modes in a high loss loaded gyrotron traveling wave amplifier (invited)," Progress In Electromagnetics Research C. Vol. 111, 35-46, 2021.

[7] Y. Xu, W. J. Wang, T. H. Peng, Y. Mao, Z. B. Zheng, Z. H. Liu, and Y. Luo, "Design and test of a broadband rectangular waveguide TE10–TE20 mode converter", Electronics Letters, vol. 56, no. 15, pp. 778–779, July, 2020.

[8] X. Q. Gong, W. J. Wang, G. Liu, Y. J. Cao, Y. Wang, W. Jiang, Y. L. Yao, G. X. Shu. J. X. Wang and Y. Luo, “An improved overmoded-waveguide method for the accurate measurement of dielectric properties in the sub-terahertz band,” J Infrared Milli Terahz Waves, vol. 44, pp. 265–280, Feb, 2023.

[9] Y. Xu, Y. Mao, W. J. Wang, Yong Luo, J. X. Wang, Ran Yan, Yelei Yao, Wei Jiang, Guo Liu, and Hongfu Li, "Proof-of-Principle Experiment of a 20-kW-Average-Power Ka-Band Gyro-Traveling Wave Tube With a Cut-Off Waveguide Section," IEEE Electron Device Letters, vol. 41, no. 5, pp. 769-772, May 2020.