高次模在基片集成波导滤波器中的应用研究

发布时间：2018-03-14 12:31

本文选题：基片集成波导　切入点：高次模　出处：《南京理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：基片集成波导(Substrate Integrated Waveguide,SIW)滤波器具有品质因数高、损耗小、尺寸小、易集成等优点,因此近年来被大量应用在实际工程中。如今,随着通信系统对滤波器性能要求的不断提高,高次模不再是被要求抑制掉的谐振模式。越来越多的研究表明,在滤波器设计过程中不仅可以利用多模谐振器设计双通带滤波器、双模滤波器,还可通过引入高次模构造交叉耦合,从而实现准椭圆滤波器,改善带外抑制特性。因此本文将重点研究高次模在SIW滤波器中的应用,并在充分调研了 Ⅴ波段SIW滤波器研究现状的基础上结合项目需求,研制了多款Ⅴ波段SIW准椭圆滤波器、SIW双通带滤波器和SIW双模滤波器。首先,本文基于物理交叉耦合和模式交叉耦合两种方法,探讨了高次模在SIW准椭圆滤波器中的应用,深入分析了有限传输零点的产生机制,并研制了四款SIW准椭圆滤波器。一方面,通过引入高次模,可以在单层结构中实现交叉耦合,简化了刻槽工艺,降低了加工难度。另一方面,有限传输零点的产生使滤波器的带外抑制特性大大提高,矩形系数明显改善。目前部分滤波器已成功应用在实际项目中。此外,本文还利用高次模研制了SIW双通带滤波器和双模滤波器。其中SIW双通带滤波器采用TE_(101)和TE_(201)模式,其结构简单,体积小且易于加工。而SIW双模滤波.器则有别于经典结构中采用TE_(201)和TE_(102)模式简并,尝试性地采用了 TE301和TE_(102)模式简并,使滤波器呈对称结构,降低了设计难度。实测结果表明,本文研制的SIW滤波器与仿真结果吻合度较好,有较大的工程应用价值。
[Abstract]:Substrate Integrated waveguide siw filter has many advantages such as high quality factor, small loss, small size and easy integration, so it has been widely used in practical engineering in recent years. The high order mode is no longer the resonant mode which is required to be suppressed. More and more researches show that in the design of the filter, not only can the double pass band filter and double mode filter be designed by using multi mode resonator, but also the double mode filter can be designed by using multi mode resonator. It is also possible to construct cross coupling by introducing high order modes to realize quasi elliptic filters and improve the out-of-band suppression characteristics. Therefore, this paper will focus on the application of high order modes in SIW filters. Based on the investigation of the current situation of V band SIW filters, we have developed several V band SIW quasi elliptic filters, including SIW double pass band filters and SIW double mode filters. Based on physical cross coupling and mode cross coupling, this paper discusses the application of high order mode in SIW quasi elliptic filter, deeply analyzes the generation mechanism of 00:00 finite transmission, and develops four SIW quasi elliptic filters. By introducing high order mode, the cross coupling can be realized in single-layer structure, the groove cutting process is simplified, and the processing difficulty is reduced. On the other hand, the generation of 00:00 finite transmission greatly improves the out-of-band suppression characteristics of the filter. The rectangular coefficient has been improved obviously. At present, some filters have been successfully used in practical projects. In addition, SIW double-pass band filter and dual-mode filter are developed by using high-order mode. Among them, SIW double-pass band filter adopts Tet _ p _ 101) and T _ s _ s _ (201) mode. It is simple in structure, small in size and easy to be machined. The SIW dual-mode filter is different from the classical structure, which uses Tet _ T _ T _ (201) and T _ s _ (10 ~ (2)) degenerate mode, and tries to degenerate the TE301 and T _ T _ T _ (102) mode to make the filter symmetrical. The experimental results show that the SIW filter developed in this paper is in good agreement with the simulation results and has great engineering application value.
【学位授予单位】：南京理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN713

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