薄层等离子体增强微波接收特性实验及数值仿真

Experimental and numerical studies on enhancement of microwave receiver characteristics by a thin plasma layer

等离子体是一种多模式、宽频谱电磁介质,可以与不同波段电磁波相互作用,实现对电磁信号的调制。报告了薄层等离子体增强微波信号接收特性实验研究的初步结果,并进行了数值仿真分析。在实验中发现了薄层等离子体结构对微波电磁信号的接收增强效果;且这种技术不仅可以在较宽频带内提高天线接收到电磁辐射的强度,同时也保持了良好的微波信号质量。进一步建立了相应物理模型并对实验结果进行了数值仿真分析研究。基于局域表面等离子体激元理论,分析了微波接收信号增强的机理,并初步得到了微波频率、薄层厚度、碰撞频率等参数对微波接收增强特性的调制规律。

As a multimode and wideband electromagnetic medium, plasma is able to interact with electro-magnetic waves signal in various spectra to modulate the electromagnetic signals. In this paper, experi-mental results of signal enhancement in microwave receivers by thin layer plasmas were reported and nu-merically simulated. It is found that the thin layer plasma structure can intensify the receiving gain of mi-crowave electromagnetic signals. Not only can this technology enhance the electromagnetic radiation in a wideband, but also maintain good signal quality. Based on local surface plasmon polarization theory, the corresponding physical model and numerical simulation were carried out to reveal the characteristics and mechanism of the process. The enhancement and modulation as well as their relation with microwave frequency, layer thickness, and collisional frequency in the plasma were further studied.