Prof. Chengjie Zuo, University of Science and Technology of China, China

K4-2: 9:45-10:30, Oct. 25, 2024, Friday

Title: High-Frequency and Wideband RF Filters for 6G and Wi-Fi 7

Abstract:

This talk will first give an overview on advanced chip-level RF filter technologies that have been developed and commercialized during the deployment of 3G, 4G and 5G wireless communications. These include the conventional SAW, BAW/FBAR, LTCC filters, as well as the emerging IHP-SAW, XBAR and Hybrid technologies. To further enhance filter performance for 6G and Wi-Fi 7 applications, three aspects of research have been pursued on next-generation acoustic resonators at the SRS lab of USTC. Lamb wave resonators at different Euler angles were studied on suspended X-cut LiNbO3 thin film to achieve quality factor (Q) larger than 100,000 at parallel resonance for a 6.5-GHz resonator. Fin-mounted design and half-electrode reflector were adopted to enable a 25-GHz A1-mode resonator that demonstrated the highest figure of merit (FoM of 21) among reported mmWave acoustic resonators in the 5G FR2 frequency range. Finally, a new kind of coupled shear mode SAW (X-SAW) resonator was proposed recently to break through the current limits on the conventional SAW technology, so as to achieve an extraordinarily large electromechanical coupling coefficient (k²) of 34% and high Bode-Q_max of 650 at 5 GHz, which has the potential to revolutionize the acoustic filter industry.

Biography:

Dr. Chengjie Zuo is a professor in the School of Microelectronics at the University of Science and Technology of China (USTC) and the founder of YUNTA Technologies. Dr. Zuo received the B.S. degree in electronic information science and technology from the University of Science and Technology of China (USTC), the M.Sc. degree (with honors) in electrical engineering from Delft University of Technology (TU Delft), and the Ph.D. degree in electrical and systems engineering from the University of Pennsylvania (Penn). Dr. Zuo is an IEEE senior member and a recipient of multiple awards including the IEEE Solid-State Circuits Society Predoctoral Fellowship. Dr. Zuo has published more than 50 papers, 140 US patent applications (among which 98 patents have been granted), and 120 Chinese patent applications.