概括
这项研究引入了新的偏振选择性超材料,以同时控制电磁波辐射和散射. 开发的超表面增强了天线增益,并减少了广泛频段的雷达截面 (RCS).
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
- 天线工程天线工程
背景情况:
- 超材料 (MMs) 提供了对电磁波的先进控制.
- 在宽带中同时控制辐射和散射波是一个重要的研究挑战.
研究的目的:
- 开发一种宽带方法,同时调节天线辐射性能和平台散射特征.
- 为集成波控引入偏振选择性超材料.
主要方法:
- 极化选择性元材料单元的设计和制造,包括传输和反射相组件.
- 开发偏振选择性波面转换器和棋盘元面.
- 与模拟和实验验证的天线平台集成.
主要成果:
- 从8-12 GHz实现了7.3dBi的平均辐射增益改善.
- 在8-12 GHz范围内,已证明平均单静电雷达截面 (RCS) 降低超过10dB.
- 对于从0°到50°的入射角度,显示了超过10dB的平均双眼RCS降低.
结论:
- 拟议的超材料方法可以同时对电磁辐射和散射进行宽带控制.
- 这项工作提供了一种提高天线性能,同时降低目标检测能力的方法.
相关概念视频
Parallel Resonance
198
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:
198
Characteristics of Series Resonant Circuit
239
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:
239
Series Resonance
158
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...
158


