基于基片集成技术的交叉耦合腔体滤波器的延伸研究

发布时间：2019-03-09 17:46

【摘要】：随着当前无线通信的快速发展、通信传递方式的多样化,对整个通信系统提出了诸如高集成、小型化、低成本等一系列要求,而微波滤波器作为通信系统中的关键器件,对整个通信系统有着重大影响。基片集成波导(Substrate Integrated Waveguide,SIW)具有传统金属波导的高品质因数、高功率容量等优点,同时具备微带结构的体积小、易集成等优点,因而在微波系统中得到广泛应用。基片集成波导技术可以通过谐振腔方式在平面电路中集成滤波的功能,从而实现滤波器的集成化与小型化;而交叉耦合技术可以通过引入有限的传输零点来提高滤波器的带外抑制,进一步提高滤波器的选择特性。基于上述考虑,本文立足于基片集成波导谐振腔的滤波特性,结合交叉耦合方式,针对高选择性的滤波器结构进行了研究和设计。1、从滤波器设计的原理出发,介绍了微波滤波器的基本理论以及滤波器的性能指标,给出了一般滤波器的设计方法。2、在研究了基片集成波导、基片集成同轴线的传输特性基础上,利用矩形腔体设计了单层两腔、四腔体滤波器并给出了仿真结果。3、重点研究了交叉耦合的技术原理,在此基础上设计出应用基片集成波导技术的交叉耦合腔体滤波器,通过引入传输零点,提高了滤波器的频率选择性能。4、在单层交叉耦合结构的基础上设计了双层结构的交叉耦合滤波器,通过引入传输零点,改善滤波器的带外抑制能力。5、设计了一款中心频率为15GHz的过模腔体滤波器,选择合适的馈电端口位使滤波器的上下阻带各产生一个传输零点,有效地改善滤波器的频率选择以及阻带的抑制性。6、设计了基于高次模的Q波段基片集成波导滤波器,降低了高频率段器件加工难度。同时设计了基于六边形谐振腔的高次模滤波器,采用双层结构,利用交叉耦合产生传输零点。在传统微带馈电的基础上,使用基片集成同轴线对滤波器进行馈电,在上下层分别构成两个腔体,形成两条传输路径产生传输零点,改善滤波器选择性。
[Abstract]:With the rapid development of wireless communication and the diversification of communication transmission methods, a series of requirements such as high integration, miniaturization and low cost are put forward for the whole communication system. Microwave filter is the key device in the communication system. It has a great influence on the whole communication system. Substrate integrated waveguide (Substrate Integrated Waveguide,SIW) is widely used in microwave systems because of its advantages of high quality factor, high power capacity, small size of microstrip structure, easy integration and so on. The technique of substrate integrated waveguide can integrate the function of filter in planar circuit by resonant cavity mode, so as to realize the integration and miniaturization of filter. The cross-coupling technique can improve the out-of-band suppression of the filter by introducing the limited transmission zeros, and further improve the selection characteristics of the filter. Based on the above considerations, based on the filter characteristics of the substrate integrated waveguide resonator, combined with the cross-coupling mode, the structure of the filter with high selectivity is studied and designed. 1, starting from the principle of filter design, The basic theory and performance index of microwave filter are introduced, and the design method of general filter is given. 2. On the basis of studying the transmission characteristics of substrate integrated waveguide and substrate integrated coaxial line, The single-layer two-cavity and four-cavity filters are designed by using rectangular cavity and the simulation results are given. 3. The principle of cross-coupling is mainly studied. On this basis a cross-coupling cavity filter based on substrate integrated waveguide technology is designed. The frequency selection performance of the filter is improved by introducing transmission zeros. 4. Based on the single-layer cross-coupling structure, a double-layer cross-coupled filter is designed, and the transmission zero is introduced. To improve the out-of-band rejection ability of the filter, an over-mode cavity filter with the center frequency of 15GHz is designed, and the appropriate feed port position is selected to produce a transmission zero for the upper and lower stop bands of the filter. 6. A Q-band substrate integrated waveguide filter based on high-order mode is designed, which reduces the processing difficulty of high-frequency device. At the same time, a high-order mode filter based on hexagonal resonator is designed, which adopts a double-layer structure and uses cross-coupling to generate transmission zeros. On the basis of the traditional microstrip feed, the filter is fed by the substrate integrated coaxial line, and two cavities are formed in the upper and lower layers respectively, forming two transmission paths to produce transmission zeros and improving the selectivity of the filter.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN713

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