探索用于隐形应用的axicon编码元表面的EM波扩散能力
Optics express
|November 29, 2023
概括
这项研究引入了一种新的编码元表面设计,用于增强电磁波扩散和雷达截面减小 (RCSR). 创新的axicon超表面为金属物体在广泛的频率范围和冲击角度提供了显著的隐形能力.
科学领域:
- 物理与工程 物理与工程
- 电磁学 电磁学 电磁学 电磁学
- 超材料是什么?超材料是什么?
背景情况:
- 编码元表面对于隐形应用至关重要,它使电磁波 (EM) 的扩散分散成为可能.
- 现有的设计方法往往缺乏系统的公式,并且在没有广泛的优化的情况下努力平衡均扩散与低反射功率.
- 2D axicon metasurfaces用于扩散和雷达截面减小 (RCSR) 在隐形中的应用以前没有被探索过.
研究的目的:
- 介绍一种新的单层编码元表面设计,采用轴子相面罩.
- 证明电磁波的有效扩散,并实现对金属物体的显著RCSR.
- 为隐形应用提供强大的,计算效率高的设计方法.
主要方法:
- 一个单层编码元表面的设计,其中包含一个轴子相面罩.
- 理论计算以建模电磁波扩散和散射.
- 数字模拟和实验验证以确认性能.
- 分析RCSR和扩散散在各种冲击角度和极化下.
主要成果:
- 拟议的轴子编码元表面在正常发生时达到超过10dB的RCSR.
- 在正常发生率下,10dB的RCSR带宽跨越15至35GHz (80%的分数带宽).
- 扩散散射和RCSR在所有极化中保持在60°的异常发病率.
- 该设计显示了统一的扩散散射图和显著的RCSR.
结论:
- 展示的轴子编码元表面为EM波扩散和RCSR提供了快速,稳健和有效的解决方案.
- 这种方法显著提高了金属物体的隐形能力.
- 该设计的宽带宽和角稳定性使其对实际隐形应用非常有吸引力.
相关概念视频
Electromagnetic Waves
8.6K
James Clerk Maxwell formulated a single theory combining all the electric and magnetic effects scientists knew during that time, calling the phenomena his theory predicted “Electromagnetic waves”. He brought together all the work that had been done by brilliant physicists such as Oersted, Coulomb, Gauss, and Faraday and added his own insights to develop the overarching theory of electromagnetism. Maxwell’s equations, combined with the Lorentz force law, encompass all the laws...
8.6K
Propagation Speed of Electromagnetic Waves
3.4K
Electromagnetic waves are consistent with Ampere's law. Assuming there is no conduction current Ampere's law is given as:
3.4K
Plane Electromagnetic Waves I
3.7K
The existence of combined electric and magnetic fields that propagate through space as electromagnetic (EM) waves is the most significant prediction of Maxwell's equations. As Maxwell's equations hold in free space, the predicted electromagnetic waves do not require a medium for their propagation. An EM wave comprises an electric field, defined as the force per charge on a stationary charge, and a magnetic field, which is the force per charge on a moving charge.
The EM field is assumed...
The EM field is assumed...
3.7K
Electromagnetic Fields
2.1K
Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
However, the observation of...
However, the observation of...
2.1K
Generating Electromagnetic Radiations
3.0K
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...
3.0K
Intensity Of Electromagnetic Waves
4.5K
The energy transport per unit area per unit time, or the Poynting vector, gives the energy flux of an electromagnetic wave at any specific time. For a plane electromagnetic wave with E0 and B0 as the peak electric and magnetic fields and traveling along the x-axis, the time-varying energy flux can be given by the following equation:
4.5K


