二級教授，博士生導師，英國工程科技協會會士（IET Fellow），電子學會/IEEE高級會員，國家高層次人才獲得者。獲電子學會優秀科技工作者、北京市青年教學名師、北京市優秀教師、國務院特殊津貼；入選教育部新世紀優秀人才、北京市科技新星、科技部中青年科技創新領軍人才。先後在新加坡南洋理工大學、韓國延世大學、德國柏林工業大學、加拿大卡爾頓大學從事博士後或高級訪問學者工作。任微波分會微波集成電路與移動通信專業委員會主任、中國通信學會電磁兼容委員會副主任和中國通信學會普及與教育工作委員會委員。長期從事天線、模拟/射頻集成電路設計及設計自動化研究的科研和教學工作。在國内外學術刊物和會議上發表高水平論文200餘篇，10餘項研究成果被公司轉化為産品。主持項目50餘項。出版編/譯著4部，其主編的《微波技術基礎》獲中國電子教育學會全國電子信息類和财經類優秀教材一等獎，被多所高校指定為本科生教材。獲國家發明專利授權30餘項，軟件著作權1項。先後獲中國通信學會科技進步二等獎和高等學校科學研究優秀成果科技進步獎各1項（均為第一完成人）。

主要研究方向

1. 模拟/射頻集成電路設計及設計自動化研究

面向通信/雷達系統等需求，進行系統架構優化設計研究；發射和接收關鍵電路研究與設計、收發高隔離關鍵技術研究；無源/有源電路及互聯結構建模與設計；通信/雷達系統模拟集成電路設計自動化等研究。實現高效率集成電路系統級解決方案。

2. 天線技術與系統集成問題研究

面向通信/雷達系統等應用需求，開展天線及智能超表面陣列/相控陣列研究與設計；新材料在電磁領域的應用研究；天線與電路的集成問題研究等。

代表性成果

模拟/射頻集成電路設計及設計自動化研究代表作：

[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.

天線技術與系統集成問題研究代表作

[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.