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相关概念视频

Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
Cut-off Mode ("Off" State): In this state, both the emitter-base and collector-base junctions are...
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Interference and Diffraction02:18

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Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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具有吸收/传输切换功能的动态元表面.

Hao Yang, Yongfeng Li, Lixin Jiang

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    此摘要是机器生成的。

    这项研究介绍了一种可重新配置的新型超表面,可以在高传输和宽带吸收状态之间动态切换. 这项技术通过克服传统频率选择性剃须刀的局限性来增强隐形应用.

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    科学领域:

    • 电磁超材料 电磁超材料
    • 隐形技术是一种隐形技术.
    • 应用电磁学 应用电磁学

    背景情况:

    • 频率选择性剃光器 (FSR) 对隐形应用至关重要,但它们的传输带可以限制雷达横截面的减少.
    • 现有的可重新配置的剃须吸收器通常只能在传输和反射模式之间切换.

    研究的目的:

    • 提出并展示一种新的电气可重新配置的超表面.
    • 为了实现宽带传输和吸收状态之间的动态功能转换.

    主要方法:

    • 集成功能阻抗层和主动频率选择性表面 (FSS) 的超表面设计.
    • 整合可调节的电阻元件,用于吸收控制.
    • 在FSS中对功能切换的活性元件进行调制.
    • 使用等效电路模型和表面电流分布进行分析.

    主要成果:

    • 已证明有效的传输 (插入损失<-1dB) 从9.3到10.9GHz不活跃时.
    • 在激活时实现宽带吸收 (8.1-12.3 GHz) 高效率.
    • 通过原型制造和测量验证了设计概念.

    结论:

    • 拟议的超表面成功地实现了在宽带宽上的动态传输-吸收功能转换.
    • 与传统的FSR相比,这种技术为隐形应用提供了增强的性能.