Kun Chai, Zhi Li, Yajuan Zhao, Liping Han, Guorui Han, Yufeng Liu
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引用次数: 0
摘要
为 C 波段应用展示了一种低调的宽带圆极化（CP）元面天线。元表面由带有 Z 形槽的 4 × 4 正方形贴片组成。利用特征模态分析研究了元表面的模态行为，并选择了一对退化模态作为工作模态。通过将槽形天线用作具有 90° 相位差的馈电结构来激励元表面的一对退化模式，从而实现了 CP 辐射。通过结合元表面和槽形天线的共振模式，CP 带宽进一步拓宽。测量结果表明，天线的 -10 dB 阻抗带宽为 3.47-4.76 GHz，3 dB 轴比带宽为 3.5-4.9 GHz，峰值增益为 6.9 dBic。此外，该天线具有良好的左旋 CP 辐射性能，外形低矮（0.046λ0）。
A low-profile wideband circularly polarized metasurface antenna based on characteristic mode analysis
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.
期刊介绍：
The prime objective of the International Journal of Microwave and Wireless Technologies is to enhance the communication between microwave engineers throughout the world. It is therefore interdisciplinary and application oriented, providing a platform for the microwave industry. Coverage includes: applied electromagnetic field theory (antennas, transmission lines and waveguides), components (passive structures and semiconductor device technologies), analogue and mixed-signal circuits, systems, optical-microwave interactions, electromagnetic compatibility, industrial applications, biological effects and medical applications.
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