Short Bio:

Yanhui Liu (Senior Member, IEEE) received the B.S. and Ph.D. degrees both in electrical engineering from the University of Electronic Science and Technology of China (UESTC) in 2004 and 2009, respectively. From September 2007 to June 2009, he was a Visiting Scholar in the Department of Electrical and Computer Engineering at Duke University, Durham, NC. In July 2011, he joined in the Department of Electronic Science, Xiamen University, China, where he was 5 years later promoted as a Full Professor. From September to December in 2017, he was a Visiting Professor at State Key Laboratory of Millimeter Waves in City University of Hong Kong. From December 2017 to December 2019, he had been with Global Big Data Technologies Centre, University of Technology Sydney (UTS) as a Visiting Professor/Research Principal. From November 2019, he has been a Professor at UESTC. He was a recipient of the UESTC Outstanding Graduate Award in 2004, the Outstanding Doctoral Dissertation Award of Sichuan Province of China in 2011, the Sichuan Province Distinguished Expert in 2021, the Young Scientist Awards of PIERS in 2022. He has authored and co-authored over 120 peer-reviewed journal articles and 50 international conference papers. He holds 21 Chinese invention patents in antennas and applied electromagnetics. His research interests include antenna array design, reconfigurable antennas, and electromagnetic scattering and imaging.

Title: Efficient Synthesis of Antenna arrays with Wideband Frequency Invariant Beam Patterns

Abstract:
Antenna Arrays with wideband frequency-invariant (FI) patterns have received increased attention due to the advantage of receiving wideband signals without wave form distortion. The FI array usually consists of antenna elements, each connected to a finite-impulse-response (FIR) filter where a set of filter coefficients are used to produce a frequency-dependent excitation required for a desired FI pattern. A typical FI pattern synthesis method is applying convex optimization to obtain appropriate FIR coefficients such that the obtained pattern has the required FI property while meeting a given sidelobe bound. However, this method costs a huge CPU time since it is involved with optimization of a large number of FIR coefficients (the total number of FIR coefficients is equal to the element number multiplied with the filter length) under a number of wideband pattern constraints. In this talk, we develop two new and efficient FI beam pattern synthesis methods: one method is called the iterative spatiotemporal Fourier transform (ISTFT) for FI pattern synthesis of uniformly spaced arrays, and the other method is a generalized alternating projection approach (GAPA) which can deal with FI pattern synthesis for nonuniformly spaced antenna arrays. Several example for synthesizing different FI patterns including FI focused and shaped patterns are conducted to validate the effectiveness of the proposed techniques. The comparison with the existing techniques are also provided to verify the advantage. FI pattern synthesis for a real antenna array structure considering mutual coupling is also provided in the examples.