Abstract:
Circularly polarized (CP) antennas are widely used in satellite communications due to their ability to suppress multipath interference and prevent polarization mismatch. With advancements in wireless communication technology, the demand for CP antennas with high gain, wide-angle scanning, broad bandwidth, low cost, and simple structure is increasing. However, achieving CP waves requires the horizontal polarization (HP) and vertical polarization (VP) components to maintain orthogonality and a 90° phase difference, ensuring an axial ratio (AR) less than 3 dB. As the scanning angle increases and the frequency deviates from the center frequency, the discrepancy between HP and VP grows, resulting in significant AR degradation. Consequently, achieving wide-angle CP beam scanning over a broad bandwidth becomes inherently challenging. Although phase-compensation techniques, such as sequential rotation or the quadrature excitation of two linearly polarized antennas, can enable broadband CP beam scanning, they increase system complexity and cost. We propose a strategy that overcomes the conventional trade-off between broad bandwidth and wide-angle scanning in CP antenna design without requiring additional phase compensation. It therefore provides a low-cost and flexible solution for broadband, wide-angle CP scanning arrays, with considerable potential for practical applications. Biography:
Chao Wang was born in Fengyang, Anhui, China, in 1996. He received the Ph.D. degree in Electromagnetic Fields and Microwave Technology from Anhui University, Hefei, China, in 2024. Since 2025, he has been a Postdoctoral Research Fellow at Anhui University. From May to December 2024, supported by the China Scholarship Council (CSC), he was a visiting Ph.D. student at the Global Big Data Technologies Centre, University of Technology Sydney, Australia. Since September 2025, he has also been a Visiting Scholar with the Department of Electrical and Computer Engineering, National University of Singapore, Singapore. His research interests include circularly polarized antenna arrays, phased-array antenna design, mechanically reconfigurable electromagnetic metasurfaces, and reflective meta-grating arrays. He also serves as a reviewer for IEEE Antennas and Wireless Propagation Letters.
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