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相关概念视频

Generating Electromagnetic Radiations01:10

Generating Electromagnetic Radiations

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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可重新配置模式的集成阵列天线,基于编码的超表面天线.

YiHang Fan, Juan Chen, ChunHui Mou

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    |April 4, 2024
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    概括

    一个新的1位数字编码元表面使一个电可调,可重新配置的集成阵列天线. 这种设计实现了多功能光束控制,包括笔光束,偏移和5GHz的多光束辐射.

    科学领域:

    • 电磁工程 电磁工程 电磁工程
    • 天线理论天线理论
    • 超材料是指一种超材料.

    背景情况:

    • 可重新配置的天线对于现代无线通信系统至关重要.
    • 现有的设计往往面临着整合,尺寸和可调性方面的挑战.
    • 超表面提供了一个有前途的方法来控制带有子波长结构的电磁波.

    研究的目的:

    • 提出和演示一个电气调节的模式可重配置的集成阵列天线.
    • 为了使用1位数字编码元表面进行精确的相位控制.
    • 为了在天线设计中实现高集成和降低配置高度.

    主要方法:

    • 一个由辐射天线和相控元表面组成的8x8阵列天线.
    • 使用矩形微条纹补丁天线作为辐射源.
    • 采用一个三层叠叠的层正方形槽单元 metasurface 装载着 varactor 二极管进行相位调节.

    主要成果:

    • 超表面成功地调节了准平面波的传输阶段.
    • 通过切换编码序列来证明模式的重新配置性.
    • 在5 GHz实现了笔光束辐射,光束偏移和多光束辐射.

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    结论:

    • 拟议的天线设计使用紧的,集成的超表面提供了高效的模式重新配置.
    • 消除了对额外的喇天线的需求,简化了结构.
    • 介绍了开发高度集成,可调节可重新配置阵列天线的新方法.