二级教授，博士生导师，英国工程科技协会会士（IET Fellow），电子学会/IEEE高级会员，国家高层次人才获得者。获电子学会优秀科技工作者、北京市青年教学名师、北京市优秀教师、国务院特殊津贴；入选教育部新世纪优秀人才、北京市科技新星、科技部中青年科技创新领军人才。先后在新加坡南洋理工大学、韩国延世大学、德国柏林工业大学、加拿大卡尔顿大学从事博士后或高级访问学者工作。任微波分会微波集成电路与移动通信专业委员会主任、中国通信学会电磁兼容委员会副主任和中国通信学会普及与教育工作委员会委员。长期从事天线、模拟/射频集成电路设计及设计自动化研究的科研和教学工作。在国内外学术刊物和会议上发表高水平论文200余篇，10余项研究成果被公司转化为产品。主持项目50余项。出版编/译著4部，其主编的《微波技术基础》获中国电子教育学会全国电子信息类和财经类优秀教材一等奖，被多所高校指定为本科生教材。获国家发明专利授权30余项，软件著作权1项。先后获中国通信学会科技进步二等奖和高等学校科学研究优秀成果科技进步奖各1项（均为第一完成人）。

主要研究方向

1. 模拟/射频集成电路设计及设计自动化研究

面向通信/雷达系统等需求，进行系统架构优化设计研究；发射和接收关键电路研究与设计、收发高隔离关键技术研究；无源/有源电路及互联结构建模与设计；通信/雷达系统模拟集成电路设计自动化等研究。实现高效率集成电路系统级解决方案。

2. 天线技术与系统集成问题研究

面向通信/雷达系统等应用需求，开展天线及智能超表面阵列/相控阵列研究与设计；新材料在电磁领域的应用研究；天线与电路的集成问题研究等。

代表性成果

模拟/射频集成电路设计及设计自动化研究代表作：

[1] Y. Li et al., "An X-Band Multifrequency Difference Frequency-Shift Keying CMOS Radar for Range Tracking and AI-Based Human Gesture Recognition," IEEE Sensors Journal, vol. 23, no. 11, pp. 11600-11614, 2023.

[2]      C. Cao et al., "CMOS X-band pole-converging triple-cascode LNA with low-noise and wideband performance," IET Circuits, Devices and Systems, vol. 16, no. 1, pp. 26-39, Jan. 2022.

[3] Y. Li et al., "A Novel Low-Power Notch-Enhanced Active Filter for Ultrawideband Interferer Rejected LNA," IEEE Transactions on Microwave Theory and Techniques, vol. 69, no. 3, pp. 1684-1697, 2021.

[4] C. Cao et al., "A power amplifier with bandwidth expansion and linearity enhancement in 130 nm complementary metal-oxide-semiconductor process," International Journal of RF and Microwave Computer-Aided Engineering, vol. 31, no. 6, Jun. 2021.

[5] C. Cao, X. Li, Y. Li, H. Zeng, Z. Wang, and U. Yasir, "A Triple-Cascode X-Band LNA Design with Modified Post-Distortion Network," Electronics, vol. 10, no. 5, p. 546, 2021.

[6] Q. Li, X. Li, Y. Xie, Z. Cao, and J. Dong, "A novel wideband multi‐mode coupled resonator filter based on bulk acoustic wave technology," International Journal of RF and Microwave Computer‐Aided Engineering, vol. 32, no. 2, p. e22983, Feb. 2021.

[7] Q. Li, X. Li, Y. Xie, Z. Cao, and J. Dong, "Synthesis of wideband bulk acoustic wave coupled resonator filter combined with lumped components," International Journal of Circuit Theory and Applications, vol. 50, no. 6, pp. 1907-1921, 2022.

[8]      Yasir U, Li X, Cao C. “Low power ASK modulator based on direct injection-locked current reuse VCO in 130-nm CMOS technology for high data rate RFID applications”. International journal of circuit theory and applications. 2022; 50(1): 56- 71.

[9]      Yasir U, Li X, Cao C, Tan T. “A low-power amplitude shift keying modulator based on adaptive body-biased injection-locked current-reuse voltage controlled oscillator for high data rate radio frequency identification applications," International Journal of Circuit Theory and Applications, 2022; 50(10): 3584-3593.

天线技术与系统集成问题研究代表作

[1] W. Zhao, X. Li, Z. Qi, and H. Zhu, "Broadband and High-Gain High-Order-Mode Fed Open-Ended Waveguide Antenna Array for Millimeter-Wave Applications," IEEE Transactions on Antennas and Propagation, vol. 70, no. 9, pp. 8614-8619, 2022.

[2] Z. Qi, Y. Zhu, and X. Li, "Compact Wideband Circularly Polarized Patch Antenna Array Using Self-Sequential Rotation Technology," IEEE Antennas and Wireless Propagation Letters, vol. 21, no. 4, pp. 700-704, Apr. 2022.

[3] J. Zhang, X. Li, Z. Qi, Y. Huang, and H. Zhu, "Dual-Band Dual-Polarization Horn Antenna Array Based on Orthomode Transducers With High Isolation for Satellite Communication," IEEE Transactions on Antennas and Propagation, vol. 70, no. 10, pp. 9247-9259, 2022.

[4] W. Zhao, X. Li, Z. Qi, and H. Zhu, "High-Order-Mode Cavity Fed Antenna Arrays for Diverse Polarizations With Compact Size, High Gain, and High Efficiency," IEEE Transactions on Antennas and Propagation, 2021.

[5] W. Zhao, X. Li, Z. Qi, and H. Zhu, "Broadband and High Gain Dual-Polarized Antenna Array With Shared Vias Feeding Network for 5G Applications," IEEE Antennas and Wireless Propagation Letters, vol. 20, no. 12, pp. 2377-2381, Dec. 2021.

[6] J. Xiao, Z. Qi, X. Li, and H. Zhu, "Broadband and High-Gain SIW-Fed Slot Array for Millimeter-Wave Applications," IEEE Transactions on Antennas and Propagation, vol. 67, no. 5, pp. 3484-3489, May. 2019.

[7] Qi, X. Li, Y. Zhang, and Y. Li, "Multi-Classification Algorithm for Human Motion Recognition Based on IR-UWB Radar," IEEE Sensors Journal, vol. 20, no. 21, pp. 12848-12858, 2020.

[8] X. Li, Q. Li, H. Zhu, Q. Li, Z. Qi, and X. Jun, "A Novel Near-Field UHF RFID Reader Array Antenna for Configurable Electrically Large Reading Area," IEEE Transactions on Antennas and Propagation, vol. 67, no. 11, pp. 6714-6723, 2019.

[9] L. Yu, X. P. Li, Z. H. Qi, H. Zhu, Y. H. Huang, and Z. Akram, "Wideband Circularly Polarized Dual-Mode Vortex Beams Reflectarray Design Using Dual-Semi-Split-Loop Elements," IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 12, pp. 2676-2680, Dec. 2019.

[10] Z. Akram et al., "Wideband Vortex Beam Reflectarray Design Using Quarter-Wavelength Element," IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 7, pp. 1458-1462, Jul. 2019.

[11] Z. Qi, X. Li, J. Xiao, and H. Zhu, "Dielectric-Slab-Loaded Hollow Substrate-Integrated Waveguide H-Plane Horn Antenna Array at $Ka$-Band," IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 9, pp. 1751-1755, 2019.

[12] Z. Qi, X. Li, J. Xiao, and H. Zhu, "Low-Cost Empty Substrate Integrated Waveguide Slot Arrays for Millimeter-Wave Applications," IEEE Antennas and Wireless Propagation Letters, vol. 18, no. 5, pp. 1021-1025, May. 2019.

[13] H. Zhu, X. Li, W. Feng, J. Xiao, and J. Zhang, "A Compact 267 GHz Shorted Annular Ring Antenna With Surface Wave Suppression in 130 nm SiGe BiCMOS," IEEE Antennas and Wireless Propagation Letters, vol. 17, no. 5, pp. 760-763, May. 2018.