In this article, a novel low‐profile asymmetric dipole antenna with artificial magnetic conductor (AMC) is presented for wideband circularly polarized operation. First, the asymmetric dipole is adopted to realize a wide impedance bandwidth. By modifying the shape of dipole arms and combing a rhombus‐shaped arm with a quasi‐triangle‐shaped arm, three resonances are achieved by the asymmetric dipole, leading to a wide impedance bandwidth. Second, an AMC surface with square patch units is introduced to reduce the antenna profile to 0.11λ₀, where λ₀ denotes the lowest operation wavelength in free space. Finally, the presented wideband circularly polarized (CP) antenna design was fabricated and tested. Reasonable agreement between the measurements and simulations is obtained, demonstrating that this CP antenna achieves a 115% impedance bandwidth (1.45‐5.4GHz) and a 97% axial ratio bandwidth (1.69‐4.88GHz). Within the CP operation band, the presented antenna yields symmetrical and unidirectional radiation patterns with a 6.7‐dBic average gain. Such a broadband and low‐profile CP asymmetric dipole antenna can be a promising candidate for a wide variety of CP wireless applications.

中文翻译：

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具有人造磁导体的薄型宽带圆极化非对称偶极天线

在本文中，提出了一种新颖的带有人造磁导体（AMC）的矮型非对称偶极天线，用于宽带圆极化操作。首先，采用非对称偶极子实现较宽的阻抗带宽。通过修改偶极子臂的形状并将菱形臂和准三角形臂组合在一起，非对称偶极子可实现三个共振，从而获得较宽的阻抗带宽。其次，AMC表面与方形贴片单元被引入到天线轮廓减少到0.11 λ ₀，其中λ ₀表示自由空间中的最低工作波长。最后，制作并测试了所提出的宽带圆极化（CP）天线设计。在测量和仿真之间获得了合理的一致性，表明该CP天线实现了115％的阻抗带宽（1.45-5.4GHz）和97％的轴向比率带宽（1.69-4.88GHz）。在CP工作频带内，所展示的天线产生对称且单向的辐射方向图，平均增益为6.7 dB。这样的宽带低剖面CP非对称偶极天线可以成为各种CP无线应用的有前途的候选者。