采用双X形环共振器的四带元材料,具有高屏蔽效率的完美吸收器
Mst Ishrat Jahan1, Mohammad Rashed Iqbal Faruque1, Md Bellal Hossain1
1Space Science Centre (ANGKASA), Institute of Climate Change (IPI), Universiti Kebangsaan Malaysia, Bangi 43600, Malaysia.
Materials (Basel, Switzerland)
|June 28, 2023
概括
这项研究介绍了一种四带元材料完美吸收器 (MPA),使用双X形环共振器进行有效的电磁干扰 (EMI) 屏蔽. 新型MPA在四个频段实现了超过99.8%的吸收率和超过45dB的屏蔽效率.
科学领域:
- 电磁学 电磁学 电磁学 电磁学
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
背景情况:
- 电磁干扰 (EMI) 在电子系统中带来了挑战,需要有效的屏蔽解决方案.
- 超材料完美吸收器 (MPA) 由于其定制的电磁反应,为先进的EMI屏蔽提供了有前途的功能.
- 现有的海洋保护区往往面临带宽和屏蔽效率的局限性,导致需要改进设计.
研究的目的:
- 设计和评估用于电磁干扰 (EMI) 屏蔽应用的四频段超材料完美吸收器 (MPA).
- 调查拟议的MPA在多个频段的吸收特性和屏蔽效果.
- 探索对MPA性能负责的潜在电磁机制.
主要方法:
- 提出了一个单元细胞设计,在罗杰斯RT5870基板上设有双双X形环共振器.
- 为了分析横向电 (TE) 和横向磁 (TM) 模式的吸收,反射和屏蔽效率,进行了模拟.
- 分析了电磁场和表面电流分布,以了解吸收机制.
- 使用ADS软件开发了一个类似的电路模型进行验证.
主要成果:
- 在四个不同的频率上,MPA的最大吸收率超过了99.8%:4.87GHz,7.49GHz,11.78GHz和13.09GHz.
- 在TE和TM模式下,在所有四个吸收带实现了超过45dB的高屏蔽效率.
- 对电磁场和表面电流的分析阐明了四频完美吸收背后的机制.
- 模拟电路模型证实了开发优质海洋保护区的潜力.
结论:
- 拟议的双X形环共振器MPA表现出优异的四频吸收和高屏蔽效率,使其适合EMI屏蔽.
- 该设计为减轻各种电子和通信系统中电磁干扰提供了有希望的解决方案.
- 使用电路建模的进一步开发可以带来优化的MPA,具有增强的性能特征.
相关概念视频
01:24Characteristics of Series Resonant Circuit
282
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
282
01:23Parallel Resonance
233
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
233
01:12Mesh Analysis for AC Circuits
399
In the domain of radio communication, the significance of impedance matching must be considered. It is crucial to ensure the efficient transmission of signals between radio transmitters and receivers. Achieving this balance involves using impedance-matching circuits, with one fundamental configuration comprising a resistor, capacitor, and inductor.
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
The process of harmonizing these impedances begins with a clear understanding of the input and output signals. Once these signals are known, the...
399
01:17Series Resonance
218
The RLC circuit impedance is defined as the ratio of the supply voltage to the circuit current. Resonance in such a circuit occurs when the imaginary part of this impedance equals zero. This specific condition means that the inductive reactance is exactly equal to the capacitive reactance. The frequency at which this happens is known as the resonant frequency. Mathematically, the resonant frequency is inversely proportional to the square root of the product of the inductance (L) and capacitance...
218
01:28Standing Waves in a Cavity
965
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
965