A simple coaxially-fed magneto-electric dipole (ME dipole) antenna is designed and experimentally evaluated. The proposed antenna does not require the conventional quarter-wavelength slot cavity for generating the magnetic dipole mode, and only consists of two simple rectangular horizontal patches, a vertical semi-rigid coaxial cable and a square ground plane. It makes the fabrication easier and can reduce the production cost. Also, as the quarter-wavelength slot cavity is removed in the proposed design, the thickness of the antenna can be reduced to 21 mm, i.e., 16.4% of the free space wavelength at the center frequency. The low-profile antenna shows comparable wide impedance bandwidth of 41.03% ( $\text{S}_{11} \leq -10 dB$ ), and a more stable and higher realized gain from 7.90 - 9.74 dBi (± 0.92 dB variation) over the operating frequency band from 1.86 GHz to 2.82 GHz (centered at 2.34 GHz). The maximum gain has increased around 9.4% when compare with that of the highest reported. While the gain variation in the passband of the proposed antenna is about 58% lower than that of those ME dipole antennas reported in the literature. The radiation mechanism and the effects of the critical parameters of the antenna are also explained with the assistance of the parametric study presented.

中文翻译：

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无槽腔的简单薄型同轴馈电偶极天线

设计并实验评估了一种简单的同轴馈电磁电偶极（ME偶极）天线。所提出的天线不需要传统的四分之一波长缝隙腔来产生磁偶极子模式，而仅由两个简单的矩形水平贴片，垂直的半刚性同轴电缆和正方形的接地平面组成。它使制造更容易并且可以降低生产成本。而且，由于在提出的设计中去除了四分之一波长缝隙腔，天线的厚度可以减小到21毫米，即中心频率处自由空间波长的16.4％。扁平天线的可比带宽阻抗为41.03％（ $ \ text {S} _ {11} \ leq -10 dB $ ），并在1.86 GHz至2.82 GHz（以2.34 GHz为中心）的工作频带上，从7.90-9.74 dBi（变化±0.92 dB）更加稳定和更高的实现增益。与报告的最高收益相比，最大收益增加了约9.4％。虽然所提出的天线的通带增益变化比文献中报道的那些ME偶极天线的增益变化低大约58％。借助所提供的参数研究，还解释了辐射机理和天线关键参数的影响。