Speaker Information

Weibiao Wang

Shoulder Limited, Wuxi, China

Abstract

With the rapid advancement of radio frequency (RF) technology, the exponential growth of data transmission has imposed stringent requirements on the bandwidth of surface acoustic wave (SAW) filters. In this talk, two promising LiNbO₃-based platforms for wideband SAW filters are presented: YX bulk LiNbO₃ (15-41 LN) and LiNbO₃-on-insulator (LNOI).The LN substrate exhibits strong piezoelectric coupling (K² > 30%), enabling filter bandwidths exceeding 10%, which is significantly larger than that achievable with conventional SAW technologies. However, bulk 15LN devices often suffer from spurious mode excitation, leading to large ripples or spurs in the passband. By adopting a novel electrode design strategy, we successfully suppressed spurious responses and developed a series of wideband, low-loss, spurious-free SAW filters with bandwidths ranging from 10% to 30%, which have already been successfully commercialized. To further enhance device performance, we also explore the LNOI platform, where thin-film confinement provides superior acoustic velocity control and effectively improve Q factor. Through device design, simulations, and preliminary fabrication results, we demonstrate that LNOI-based filters can achieve low insertion loss, good temperature stability and excellent wideband characteristics.

Speaker Biography

Weibiao Wang received his B.Sc. degree from Nanjing Normal University, Nanjing, China, in 1991, and his M.Sc. and Ph.D. degrees from Nanjing University, Nanjing, China, in 2001 and 2005, respectively. He worked as a Post-Doctoral Fellow with the State Key Laboratory on Modern Acoustics at Nanjing University from 2005 to 2006. In 2007, he joined the R&D team of Shoulder Limited, Wuxi, China, and has continued to be involved in the research and development of SAW devices as CTO. He has authored or coauthored more than 60 papers and holds about 30 patents. His current research interests include the modeling, simulation, and designing of SAW components.

Key Achievements:

• Developed novel electrode design strategies for spurious mode suppression
• Successfully commercialized wideband SAW filters with 10-30% bandwidth
• Pioneering work on LNOI platform for enhanced filter performance
• 60+ technical publications and 30+ patents in SAW technology
• Council Member of the Acoustical Society of China