基于双层磁电结构多功能微波器件设计及等效电路研究

发布时间：2018-03-16 06:48

本文选题：磁电层合结构　切入点：磁电可调微波滤波器　出处：《中国计量学院》2015年硕士论文　论文类型：学位论文

【摘要】：将复合磁电材料的逆磁电效应应用于普通微波器件,既可与传统磁可调微波器件一样通过外加磁场实现高品质因子和GHz范围的频带调节,也可以通过外加电场,实现MHz范围内高精度和快速的频带调节;并且与传统的滤波器相比功耗低,噪音低,品质因子高。因此在移动通信系统和国防平台下的有源相控阵雷达以及电子战系统等领域,其具有很大潜力。在器件设计过程中,改善微带结构可以提高器件性能,而对T字型微带结构滤波器的带通效果最好;此外,曾有学者提出采用两块层合材料能够拓展带宽。虽然如此,但均是一旦器件设计定型,性能也就无法改变。在器件设计过程中,传统的研究方法是通过电磁场仿真后做成实物,而这种方法应用于磁电可调器件的设计过程中时,由于引入了磁电层合结构,考虑其复杂的材料参数和边界条件,会造成仿真时间耗时冗长。相对的,曾有学者提出采用等效电路分析的方法能够缩短仿真的时间,提高效率更为方便地预测器件的性能从而降低成本。尽管关于等效电路的工作持续进行着,但针对的模型比较单一,对于其他结构类型的器件建模工作还有待开展。针对上面的思考,本文做了以下的研究:首先,针对对T型微带线磁电可调微波滤波器,建立了集总等效电路模型。根据微波传输原理和铁磁共振机理,考虑压电层电调等效因子的影响,计算出其在等效为基于单导带的微波滤波器时的等效电路参数。同时引入了新的辐射阻抗公式,计算出了等效为基于耦合带的微波滤波器时对应的等效电路参数,建立起磁电双可调谐振器的集总等效电路模型,验证了电路的有效性,预测出不同尺寸的磁电层合结构以及外加磁场对滤波器的性能以及等效电路集总参数的影响。其次,针对由多块磁电层合结构构成的直导带磁电微波器件,根据铁磁共振机理和微波传输线理论,分别引入RLC串联谐振电路和理想变压器模型表征铁磁共振效应和微带线与磁电结构的耦合效应,最终建立起含多块磁电层合结构的磁场和电场双可调直导带微波器件的普遍集总电路模型,并验证了其有效性。之后,使用该集总等效电路对滤波器的带内特性和磁、电场调谐性能进行预测,发现应用多块磁电结构的滤波器,既可以拓宽滤波器的带宽,也可以通过调节磁电块上的外加静电、静磁场来调节其工作频段,为新型磁电器件设计提供理论依据。最后,采用双层磁电层合结构并基于微波磁电效应和铁磁共振效应,结合磁电可调单导带滤波器的带阻和与耦合带的带通性能,设计了两种空间耦合结构的功能可选性磁电可调微波滤波器,不仅继承磁电可调微波器件工作频段可调谐的优点,同时克服现有磁电可调微波器件滤波性能单一等缺陷,提高了器件的灵活性以及多功能可用性,更适合无线通信中有关频段可调方面的应用,具有很大的创新性,在我国的移动以及卫星通信等领域有很大的应用前景。
[Abstract]:The inverse application of composite magnetoelectric effect of magnetoelectric materials in ordinary microwave devices, with both the traditional magnetic tunable microwave device by applying a magnetic field to achieve high quality factor and the range of GHz band adjustment, can also be realized by external electric field, high accuracy and fast frequency range of MHz regulation; and compared with the traditional filter low power consumption. Low noise, high quality factor. So in the mobile communication system and defense platform under the active phased array radar and electronic warfare system and other fields, which has great potential. In the design process of the device, improve the microstrip structure to improve the performance of the device, and the T type microstrip bandpass filter is the best effect; in addition, there have been researchers have proposed the two pieces of laminated materials to expand the bandwidth. However, but once the device is finalize the design, performance cannot be changed. In the design process of the device, the traditional research This method is through the electromagnetic field simulation made in kind, and this method is applied to the design process of the magnetoelectric transfer device is due to the introduction of the magnetoelectric laminated structure, considering the complex material parameters and boundary conditions, will cause the simulation time consuming. In contrast, some scholars have proposed the method of equivalent circuit analysis to to shorten the simulation time and improve the efficiency is more convenient to predict the performance of the device and reduce the cost. Although the equivalent circuit of the ongoing work, but the model is relatively simple, for other types of device modeling structure remains to be carried out. According to the above consideration, this article has done the following research: first, in view of the T type magnetoelectric tunable microstrip line microwave filters, a lumped equivalent circuit model. According to the principle of microwave transmission and ferromagnetic resonance mechanism, considering the piezoelectric layer electrically adjustable effect factor etc. In effect, calculate the equivalent parameters of the equivalent circuit of microwave filters based on the single band. While introducing a new formula of the radiation impedance, equivalent circuit parameters corresponding to calculate the equivalent coupling with microwave filter based on the established themagnetoelectric can be lumped equivalent circuit model of tuned oscillator, verified the effectiveness of the circuit, predict the different dimensions of magnetoelectric layer structure and magnetic field on the performance of the filter and the equivalent circuit of lumped parameters. Secondly, according to the direct conduction band magnetoelectric microwave devices is composed of a plurality of magnetoelectric laminated structure, according to the ferromagnetic resonance mechanism and microwave transmission line theory, introduced the RLC series coupling the effect of the resonant circuit and ideal transformer model characterization of ferromagnetic resonance and microstrip line and magnetoelectric structure, finally established with multi block magnetoelectric laminated magnetic and electric structure of the double adjustable straight guide Generally lumped circuit model with microwave devices, and to verify its effectiveness. After that, the filter band characteristics and magnetic using the lumped equivalent circuit, electric tuning performance prediction filter, found that application of multi block magnetoelectric structure, can not only broaden the bandwidth of the filter, also can be adjusted by the addition of static magnetic block the static magnetic field to adjust the working frequency, and provide a theoretical basis for the design of a new type of magnetic electric device. Finally, using the double magnetoelectric laminated structure and microwave magnetoelectric effect and ferromagnetic resonance effect based on the combination of magnetoelectric bandstop tunable single conduction band filter and coupling with the band bandpass performance, designed the function of magnetoelectric optional two kinds of spatial coupling structure of tunable microwave filters, not only inherits advantages of magnetoelectric tunable frequency tunable, and overcome the existing magnetoelectric tunable filtering performance of single. It has improved the flexibility and versatile availability of the device, and is more suitable for the application of tunable frequency band in wireless communication. It has great innovation and has great application prospects in mobile and satellite communications in China.

【学位授予单位】：中国计量学院
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN61

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