Compact Ultra-Wideband Monopole Antennas Using Novel Liquid Loading Materials
Compact Ultra-Wideband Monopole Antennas Using Novel Liquid Loading Materials
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DOI：
10.1109/access.2019.2909944
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发表时间：
2019-04
期刊：
影响因子：
3.9
通讯作者：
Chaoyun Song;E. L. Bennett;Jianliang Xiao;Qiang Hua;Lei Xing;Yi Huang
中科院分区：
文献类型：
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作者：
Chaoyun Song;E. L. Bennett;Jianliang Xiao;Qiang Hua;Lei Xing;Yi Huang
首次将离子液体（IL）用于制备天线。与水不同，该材料具有较大的液体范围（−69.8 °C-350 °C），相对介电常数为1.03，极低的介电损耗和非常稳定的热物理材料特性。它可以用于液体介质谐振器天线（DRA）或作为性能增强的加载材料。重要的是，所提出的液体加载方案是相对简单和低成本的，但它可以显着提高天线性能。作为设计实例，首先给出了一个具有全向辐射方向图的液体加载宽带线极化（LP）微带天线。然后，LP天线被修改为宽带圆极化（CP）天线，具有波束辐射。这些天线示例展示了1.25-5 GHz的频率覆盖范围、宽CP带宽、相对高的增益（>4 dBi）、> 85%的高辐射效率以及0.42\，\，\lambda_{0}\x 0.42 \lambda _{0}\x 0.17\lambda_{0}$的电气尺寸。实验结果表明，液体加载在较宽的温度范围内工作良好。它有效地减少了40%的天线电气尺寸，并提高了5dB的阻抗匹配。因此，所提出的液体加载方案可以应用于各种天线/RF设计。
An ionic liquid (IL) is used to make antennas for the first time. Unlike water, the proposed material has a large liquid range (−69.8 °C–350 °C), a relative permittivity of≈3, an extremely low dielectric loss, and very stable thermophysical material properties. It can be used for liquid dielectric resonator antennas (DRAs) or as a loading material for performance enhancement. Importantly, the proposed liquid loading scheme is relatively simple and of low cost, but it can markedly improve the antenna performance. As design examples, a liquid-loaded wideband linearly polarized (LP) monopole antenna with an omnidirectional radiation pattern is first presented. Then, the LP antenna is modified to a wideband circularly polarized (CP) antenna with boresight radiation. These antenna examples demonstrate a frequency coverage of 1.25–5 GHz, a wide CP bandwidth, a relatively high gain (>4 dBi), high radiation efficiency >85%, and an electrical size of $0.42\,\,\lambda _{0}\times 0.42 \lambda _{0}\times 0.17\lambda _{0}$ . The experimental results show that the liquid loading works well under a wide range of temperatures. It effectively reduces the antenna electrical size by 40% and improves the impedance matching by 5 dB. Therefore, the proposed liquid loading scheme can be applied to a variety of antenna/RF designs.