Wang, Y., Ding, Z., Yu, J., Cao, J., Wang, H., Chia, M. Y., & Nasimuddin, N. (2024). Metasurface‐based circularly polarised antenna: Enhanced bandwidth with characteristic mode analysis and symmetric branch design. IET Microwaves, Antennas & Propagation. Portico. https://doi.org/10.1049/mia2.12516
Abstract:
A low‐profile circularly polarised (CP) metasurface antenna is proposed, utilising characteristic mode analysis (CMA). The antenna design features a two‐layer laminated substrate, a 4×4 Butterfly‐shaped metasurface, a rectangular slot, an irregular transmission line, and a ground plane. The metasurface is analysed using mode significance (MS), characteristic angle (CA), and characteristic current to determine the resonance bandwidth and CA resonance points, which exhibit a near 90° difference. At the intersection of the two MS modes, their CAs differ by nearly 90°, and their far‐field radiation directions align, indicating the potential for achieving circular polarisation at the desired frequency. The integration of the metasurface with the slot antenna is simulated to validate the CMA findings. Additionally, the CP bandwidth is enhanced by modifying the transmission line branches. Measurement of the fabricated antenna reveals an impedance bandwidth (IBW) of 27.4%, a 3‐dB axial ratio bandwidth (ARBW) of 10.1%, and a peak gain of 6.9 dBic at 4.4 GHz. Compared to the design without branches, IBW and ARBW have increased by 10% and 7.3%, respectively.
License type:
Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)
Funding Info:
This research / project is supported by the Youth Foundation of Jiangsu Province - N/A
Grant Reference no. : BK20230919
This research / project is supported by the Postdoctoral Research Foundation of China - N/A
Grant Reference no. : 2023M731680
This research / project is supported by the Postgraduate Research &Practice Innovation Program of Jiangsu Province in China - N/A
Grant Reference no. : KYCX23‐0467