电可控频率选择表面的研究及其应用

发布时间：2018-01-12 12:40

本文关键词：电可控频率选择表面的研究及其应用　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：频率选择表面（Frequency Selective Surface，简称FSS），是近些年来备受关注的一种微波器件，可以通过自身的谐振作用在一定频率范围内实现对入射电磁波的带通和带阻的滤波作用。本文围绕这一热点研究课题，，在传统无源频率选择表面的基础上，开展了电可控频率选择表面的一系列研究。首先，本文对频率选择表面实现滤波的物理机制进行了探讨，介绍了频率选择表面的分类和基本构型，选择了各方面性能都表现的较为优越的方形环为基本构型，设计了电可控频率选择表面单元模型，并设计了相应的偏置馈电网络，仿真分析了它的滤波特性、对入射波的角度稳定性和极化稳定性，并对它通过调节偏置电压实现中心谐振频率可调的特点进行了深入研究。然后，设计了电磁波吸收、反射电可控的频率选择表面，通过调节偏置电压的通断改变对入射电磁波的吸收和反射，通过调节偏置电压的大小调节吸波的频率范围，并对入射波极化敏感度和角度敏感度进行了仿真分析。将电磁波吸收、反射电可控的频率选择表面应用于战略武器的雷达天线罩中，可以实现隐身与非隐身的灵活切换，具有重要的现实意义。最后，将电可控频率选择表面应用于微带天线实现小型化。提取了基于电可控频率选择表面的超材料的本构参数，在等效介电常数和等效磁导率峰值频率处，设计了两种小型化天线模型，分析了谐振频率和辐射特性，并对小型化天线的中心谐振频率电可调的特点进行了研究。结果表明超材料的超常媒质特性可以大幅度提高天线的小型化程度，这对于小型化天线的研究有重要的理论意义。本文对于电可控频率选择表面及其在电磁波吸收、反射滤波器和小型化微带天线上的应用，进行了较为完整的从理论到设计及仿真验证的一系列研究，首次提出了电磁波吸收反射电可控的频率选择表面，以及基于频率选择表面的电可控小型化微带天线，具有重要的创新意义，为相关学者今后在这一领域内的研究提供了一定的指导意义。
[Abstract]:Frequency Selective Surface (FSS) is a kind of microwave device which has attracted much attention in recent years. The bandpass and band-stop filtering of incident electromagnetic waves can be realized within a certain frequency range by its own resonant action. This paper focuses on this hot topic on the basis of the traditional passive frequency selective surface. A series of studies on electrically controllable frequency selective surfaces have been carried out. Firstly, the physical mechanism of frequency selective surface filtering is discussed, and the classification and basic configuration of frequency selective surface are introduced. Choosing the superior square ring as the basic configuration, the electrically controllable frequency selective surface unit model is designed, and the corresponding bias feed network is designed, and its filtering characteristics are simulated and analyzed. The angle stability and polarization stability of incident wave are studied, and the characteristic that the central resonant frequency can be adjusted by adjusting the bias voltage is studied deeply. Then, the frequency selective surface of electromagnetically controllable reflection is designed to absorb and reflect the incident electromagnetic wave by adjusting the on-off of bias voltage. The frequency range of the absorbing wave is adjusted by adjusting the bias voltage, and the polarization sensitivity and angle sensitivity of the incident wave are simulated and analyzed. The electromagnetic wave is absorbed. The frequency selective surface controlled by reflecting electricity can be used in the radar radome of strategic weapon, which can realize the flexible switching between stealth and non-stealth, which has important practical significance. Finally, the electrically controllable frequency selective surface is applied to the microstrip antenna to achieve miniaturization. The constitutive parameters of the supermaterial based on the electrically controllable frequency selective surface are extracted at the peak frequency of equivalent dielectric constant and equivalent permeability. Two miniaturized antenna models are designed and the resonant frequency and radiation characteristics are analyzed. The characteristics of electrically adjustable central resonant frequency of the miniaturized antenna are studied. The results show that the supernormal medium characteristics of the supermaterial can greatly improve the miniaturization of the antenna. This is of great theoretical significance for the study of miniaturized antennas. In this paper, the electrically controllable frequency selective surface and its applications in electromagnetic wave absorption, reflection filter and miniaturized microstrip antenna have been studied from theory to design and simulation. For the first time, the frequency selective surface of electromagnetic-wave absorption and reflection and the electrically controllable miniaturized microstrip antenna based on frequency-selective surface are proposed, which is of great significance in innovation. It provides some guidance for the related scholars in the future research in this field.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN820

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