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A low-profile wideband circularly polarized metasurface antenna based on characteristic mode analysis
Published online by Cambridge University Press: 07 December 2023
Abstract
A low-profile wideband circularly polarized (CP) metasurface antenna is demonstrated for C-band applications. The metasurface consists of 4 × 4 square patches with Z-shaped slots. Characteristic mode analysis is used to investigate the modal behavior of the metasurface, and a pair of degenerate modes is chosen as the operating modes. The CP radiation is realized by exciting a pair of degenerate modes of the metasurface through a slot antenna, which is used as a feed structure with a 90° phase difference. The CP bandwidth is further widened by combining the resonance modes of the metasurface and slot antenna. The measured results show that the −10 dB impedance bandwidth of the antenna is 3.47–4.76 GHz, and the 3 dB axial ratio bandwidth is 3.5–4.9 GHz with a peak gain of 6.9 dBic. Moreover, the antenna exhibits well left-hand CP radiation performances with a low profile of 0.046λ0.
- Type
- Metamaterials and Photonic Bandgap Structures
- Information
- International Journal of Microwave and Wireless Technologies , Volume 16 , Issue 2 , March 2024 , pp. 244 - 251
- Copyright
- © The Author(s), 2023. Published by Cambridge University Press in association with the European Microwave Association