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首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >A Low-Profile High-Gain and Wideband Log-Periodic Meandered Dipole Array Antenna with a Cascaded Multi-Section Artificial Magnetic Conductor Structure
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A Low-Profile High-Gain and Wideband Log-Periodic Meandered Dipole Array Antenna with a Cascaded Multi-Section Artificial Magnetic Conductor Structure

机译：具有级联多节人工磁导体结构的薄型高增益宽带对数周期曲折偶极子阵列天线

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摘要

This paper presents a low-profile log-periodic meandered dipole array (LPMDA) antenna with wideband and high gain characteristics. The antenna consists of 14 dipole elements. For compactness, a meander line structure is applied to each dipole element to reduce its physical length. As a result, a compact and wideband LPMDA antenna is realized, exhibiting a wide impedance bandwidth of 1.04–5.22 GHz (ratio bandwidth of 5.02:1) for | | < −10 dB. To enhance the antenna gain performance while maintaining the wideband behavior, the LPMDA antenna is integrated with a new design of an artificial magnetic conductor (AMC) structure. The designed AMC is realized by combining three AMC structures of different sizes to form a cascaded multi-section AMC structure, of which its overall operating bandwidth can continuously cover the entire impedance bandwidth of the LPMDA antenna. The proposed AMC-backed LPMDA antenna is experimentally verified and its measured −10 dB reflection bandwidth is found to be in the range of 0.84–5.15 GHz (6.13:1). At the main beam direction within the operating frequency bandwidth, the gain of the proposed AMC-backed LPMDA antenna ranges from 7.15–11.43 dBi, which is approximately 4 dBi higher than that of an LPMDA antenna without an AMC. Moreover, the proposed antenna has a low profile of only 0.138 . ( is the free-space wavelength at the lowest operating frequency).
机译：本文提出了一种具有宽带和高增益特性的低剖面对数周期曲折偶极子阵列（LPMDA）天线。天线由14个偶极子元素组成。为了紧凑，将曲折线结构应用于每个偶极元件以减小其物理长度。结果，实现了紧凑的宽带LPMDA天线，对于| | | | |，其阻抗带宽为1.04–5.22 GHz（比率带宽为5.02：1）。 | <-10 dB。为了在保持宽带性能的同时提高天线增益性能，LPPMA天线与新设计的人造磁导体（AMC）结构集成在一起。通过组合三个不同大小的AMC结构以形成级联的多段式AMC结构，可以实现设计的AMC，其总工作带宽可以连续覆盖LPMDA天线的整个阻抗带宽。提议的AMC支持的LPMDA天线已通过实验验证，其测量的-10 dB反射带宽在0.84–5.15 GHz（6.13：1）范围内。在工作频率带宽内的主波束方向上，建议的AMC支持的LPMDA天线的增益范围为7.15–11.43 dBi，比不使用AMC的LPMDA天线的增益高约4 dBi。此外，所提出的天线仅具有0.138的低轮廓。 （是最低工作频率下的自由空间波长）。

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