超材料微波带通滤波器的仿真设计与实验研究

发布时间：2018-04-13 15:23

本文选题：超材料 + 微波　；参考：《中国矿业大学》2017年硕士论文

【摘要】：超材料是一种自然界中不存在的、人工合成的复合结构或复合材料,它具有一些天然材料所不具备的超常物理性质,如负折射率、逆多普勒效应,具有重要的应用前景,因而受到了人们的极大关注。基于超材料的设计理念,人们经过合理的设计,能够实现具有较高性能滤波特性的带通滤波器。本文设计了四种基于金属(Metal)-介质(Dielectric)-金属(Metal)(MDM)夹层结构的超材料微波带通滤波器,并在理论和实验上研究了它们的滤波特性,主要结果如下:(1)设计了两种多波段超材料微波带通滤波器。研究表明双波段带通滤波器在0-12 GHz频率范围内具有两个稳定的透射通带,两个通带-3 dB频率范围为3.50-4.55 GHz和7.69-8.55 GHz,中心频率为4.03 GHz和8.12 GHz,相应的透过率为-0.30 dB和-0.25 dB;三波段带通滤波器在4-16 GHz频率范围内具有三个稳定的透射通带,三个通带-3 dB频率范围为5.35-6.80 GHz、8.33-9.75 GHz和11.12-12.43 GHz,中心频率为6.07 GHz、9.04 GHz和11.77 GHz,相应的透过率为-0.15 dB、-0.28 dB和-1.09 d B。两种滤波器均具有极化不敏感和大角度入射稳定的特性。此外,研究还发现基片集成波导(Substrate Integrated Waveguide,SIW)技术的引入能有效改善三波段带通滤波器的大角度入射性能表现。(2)设计了两种可调超材料微波带通滤波器。研究表明机械可调带通滤波器在8-12 GHz频率范围内存在一个唯一的谐振频点。谐振频率随着两个结构之间的距离的变化而变化,且二者近似成线性关系;电可调带通滤波器在不加馈电网络时在4-10 GHz频率范围内仅存在一个谐振频点。随着变容二极管电容值的增大,谐振频率朝着低频方向移动。而加入馈电网络后则存在两个谐振频点,其中一个谐振频率随着电容的增大依然朝着低频方向移动,而另一个谐振频率基本维持不变,这也表明该模式来源于馈电网络的引入。这四种具有不同滤波特性的超材料滤波器能够被用作带通滤波器,并有望在微波通讯、多频成像以及军事技术等领域发挥重要的作用。
[Abstract]:Metamaterials are synthetic composite structures or composites that do not exist in nature. They have some supernormal physical properties, such as negative refractive index, inverse Doppler effect, which have important application prospects.As a result, people pay great attention to it.Based on the design concept of metamaterials, the bandpass filter with high performance can be realized by reasonable design.In this paper, four kinds of metamaterial microwave band-pass filters based on metal-metallic-dielectric-dielectric structure are designed, and their filtering characteristics are studied theoretically and experimentally.The main results are as follows: 1) two kinds of multi-band supermaterial microwave band-pass filters are designed.It is shown that the dual-band bandpass filter has two stable transmission passbands in the 0-12 GHz frequency range.The three pass band -3 dB frequency ranges from 5.35 to 6.80 GHz (8.33-9.75 GHz) and 11.12-12.43 GHz. The central frequencies are 6.07 GHz (9.04 GHz) and 11.77 GHz. The corresponding transmittance is -0.15 dB -0.28 dB and -1.09 dB.Both filters are polarization-insensitive and stable at large angles.In addition, it is also found that the introduction of substrate Integrated waveguide guide siw technology can effectively improve the large angle incidence performance of three-band bandpass filters. Two kinds of tunable supermaterial microwave band-pass filters are designed.It is shown that the mechanical tunable band-pass filter has a unique resonance frequency in the 8-12 GHz frequency range.The resonant frequency varies with the distance between the two structures, and the two are approximately linear. There is only one resonant frequency point in the 4-10 GHz frequency range of the electrically tunable band-pass filter without the feed network.With the increase of capacitance, the resonant frequency moves to the low frequency direction.There are two resonant frequency points after adding the feed network, one of which moves to the low frequency with the increase of the capacitance, while the other is basically unchanged, which indicates that the mode comes from the introduction of the feed network.These four kinds of metamaterial filters with different filtering characteristics can be used as bandpass filters and are expected to play an important role in microwave communication, multi-frequency imaging and military technology.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713;TB34

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