本文關鍵詞：電可控頻率選擇表面的研究及其應用　出處：《哈爾濱工業(yè)大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 電可控頻率選擇表面 偏置饋電 電磁波吸收/反射 超材料 小型化天線

【摘要】：頻率選擇表面（Frequency Selective Surface，簡稱FSS），是近些年來備受關注的一種微波器件，可以通過自身的諧振作用在一定頻率范圍內(nèi)實現(xiàn)對入射電磁波的帶通和帶阻的濾波作用。本文圍繞這一熱點研究課題，，在傳統(tǒng)無源頻率選擇表面的基礎上，開展了電可控頻率選擇表面的一系列研究。 首先，本文對頻率選擇表面實現(xiàn)濾波的物理機制進行了探討，介紹了頻率選擇表面的分類和基本構型，選擇了各方面性能都表現(xiàn)的較為優(yōu)越的方形環(huán)為基本構型，設計了電可控頻率選擇表面單元模型，并設計了相應的偏置饋電網(wǎng)絡，仿真分析了它的濾波特性、對入射波的角度穩(wěn)定性和極化穩(wěn)定性，并對它通過調(diào)節(jié)偏置電壓實現(xiàn)中心諧振頻率可調(diào)的特點進行了深入研究。 然后，設計了電磁波吸收、反射電可控的頻率選擇表面，通過調(diào)節(jié)偏置電壓的通斷改變對入射電磁波的吸收和反射，通過調(diào)節(jié)偏置電壓的大小調(diào)節(jié)吸波的頻率范圍，并對入射波極化敏感度和角度敏感度進行了仿真分析。將電磁波吸收、反射電可控的頻率選擇表面應用于戰(zhàn)略武器的雷達天線罩中，可以實現(xiàn)隱身與非隱身的靈活切換，具有重要的現(xiàn)實意義。 最后，將電可控頻率選擇表面應用于微帶天線實現(xiàn)小型化。提取了基于電可控頻率選擇表面的超材料的本構參數(shù)，在等效介電常數(shù)和等效磁導率峰值頻率處，設計了兩種小型化天線模型，分析了諧振頻率和輻射特性，并對小型化天線的中心諧振頻率電可調(diào)的特點進行了研究。結果表明超材料的超常媒質(zhì)特性可以大幅度提高天線的小型化程度，這對于小型化天線的研究有重要的理論意義。 本文對于電可控頻率選擇表面及其在電磁波吸收、反射濾波器和小型化微帶天線上的應用，進行了較為完整的從理論到設計及仿真驗證的一系列研究，首次提出了電磁波吸收反射電可控的頻率選擇表面，以及基于頻率選擇表面的電可控小型化微帶天線，具有重要的創(chuàng)新意義，為相關學者今后在這一領域內(nèi)的研究提供了一定的指導意義。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN820

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