Prof. Ming-Chun Tang
Chongqing University, China
Title: Ultra-Broadband Reflectarray Antennas Based on Metasurfaces
Abstract:
Reflectarray(RA) antennas are promising candidates for
long-distance wireless communication systems. However, the limited bandwidth
due to the elements’ inherent bandwidth and the different spatial phase delays
has been one of the critical challenges to practical RA antenna engineering
applications. This talk will introduce a broadband,
low-profile, and planar RA antenna based on the achromatic metasurface. The
achromatic metasurface holds advantageous ultra-broadband focusing
characteristics over the conventional reflectarrays. In the implementation, diverse
unit cells offering versatile phase responses are employed to design the
achromatic metasurface with the optimization of the convolutional algorithm. A
broadband achromatic RA antenna consisting of 45×45 unit cells is simulated,
fabricated, and tested. The measured 3-dB realized gain of the RA antenna
reaches a fractional bandwidth of 58.2%, ranging from 8.9 GHz to 16.2 GHz.
Furthermore, the RA antenna significantly enhances the feeding antenna’s gain
from 7.3 GHz to 17 GHz. The reflected metasurface also has a low profile of
0.11 λL, where λL is the wavelength in the free space at
7.3 GHz. The developed RA antenna would be a good candidate in long-distance
integrated communication systems, which benefit from the broadband property, high
gain, low profile, and ease of fabrication.
Biography:
Ming-Chun Tang is currently a full Professor in the
School of Microelectronics and Communication Engineering, Chongqing University,
China. His research interests include electrically small antennas, RF circuits,
metamaterial designs and their applications. Prof. Tang was a recipient of the
National Science Fund for Excellent Young Scholars in 2019. His Ph.D. students
received Best Student Paper Awards from the IEEE 7th Asia-Pacific
Conference on Antennas and Propagation (2018 IEEE APCAP) held in Auckland, New
Zealand, 2019 IEEE International Applied Computational Electromagnetics Society
(ACES) Symposium, Nanjing, China, 2019 IEEE International Workshop on
Electromagnetics: Applications and Student Innovation Competition, Qingdao,
China, and 2019 Cross Strait Quad-Regional Radio Science and Wireless
Technology Conference, Taiyuan, China. He is the founding Chair of the IEEE
AP-S / MTT-S Joint Chongqing Chapter. He serves on the Editorial Boards of
several journals, including IEEE Access, Electronics Letters and IET Microwaves, Antennas & Propagation.
He has also served on the review boards of various technical journals, and many
international conferences as a General Chair, TPC Member, Session Organizer,
and the Session Chair.