Liquid Metal Bandwidth-Reconfigurable Antenna
Liquid Metal Bandwidth-Reconfigurable Antenna
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DOI：
10.1109/lawp.2019.2959879
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发表时间：
2020-01-01
影响因子：
4.2
通讯作者：
Gao, Yue
中科院分区：
文献类型：
--
作者：
Alqurashi, Khaled Yahya;Kelly, James R.;Gao, Yue
这封信展示了如何使用液态金属块来连接/断开大面积的金属化，并实现使用传统开关无法实现的辐射性能。所提出的天线可以通过连接/断开馈线的接地面与辐射器的接地面来在超宽带和窄带之间切换其工作带宽。这可以通过使用传统的半导体开关来实现。然而，此类开关提供点状接触。因此，开关之间的电接触存在间隙。围绕这些间隙流动的表面电流会导致显着的反向辐射。在这封信中，液态金属块被用来完全填充间隙。这显着减少了反向辐射，增加了视轴增益，并产生与传统微带贴片天线相同的方向图。具体来说，实现的增益和总效率分别提高了 2 dBi 和 24%。该天线在采用认知无线电（CR）和频谱聚合的无线系统中具有潜在的应用。
This letter shows how slugs of liquid metal can be used to connect/disconnect large areas of metalization and achieve a radiation performance not possible by using conventional switches. The proposed antenna can switch its operating bandwidth between ultrawideband and narrowband by connecting/disconnecting the ground plane for the feedline from that of the radiator. This could be achieved by using conventional semiconductor switches. However, such switches provide point-like contacts. Consequently, there are gaps in electrical contact between the switches. Surface currents, flowing around these gaps, lead to significant back radiation. In this letter, the slugs of a liquid metal are used to completely fill the gaps. This significantly reduces the back radiation, increases the bore-sight gain, and produces a pattern identical to that of a conventional microstrip patch antenna. Specifically, the realized gain and total efficiency are increased by 2 dBi and 24%, respectively. The antenna has potential applications in wireless systems employing cognitive radio (CR) and spectrum aggregation.