8mm基片集成波导环行器的研究

发布时间：2018-09-17 20:07

【摘要】：8mm基片集成波导环行器(Substrate Integrated Waveguide简称SIW)即工作波长为8mm的基片集成波导环行器。环行器是一种重要的微波铁氧体器件,其利用的是铁氧体的非互易性。其应用非常广泛。主要应用在雷达系统中的TR组件作为级间隔离应用。也可以作为收发共用的天线的转换开关,可以切换信号的收发状态。将环行器的某一端口接上匹配负载,可以作为隔离器使用。环行器的这些特点,使其成为无线通信系统中必不可缺的元器件。传统的环行器有微带型和波导型等。波导型环行器具有高功率,高Q值,低插入损耗等优点,但是其也具有体积大的缺点。而微带型环行器具有体积小易集成的有点,但是其也具有低功率容量等缺点。随着目前通信技术的发展,亟需一种体积小易集成,同时具有高功率容量的环行器。为了研究一种兼具波导型和微带线环行器优点的环行器,研究者发现了一种新型的导波结构——基片集成波导。这类导波结构的特点是,功率容量大,体积小,易于集成,而且高频性能良好,价格低廉,可以用目前的LTCC及光刻工艺实现,适合大规模生产。而且,SIW结构在设计时可以很容易的实现上下面转换。基于SIW的这些优点,我们可以将其引入到环行器的设计当中来。基于上面的这些情况,本文根据文献首先研究了SIW的结构和传输特性,根据矩形波导获得了SIW结构的参数设计方法。并用仿真软件HFSS研究了SIW结构参数对其传输性能的影响。然后还设计了一款Ka波段的SIW结构,并在此基础上研究了SIW到微带线的转换结构。这种结构不同于一般的转换结构,采用了二次曲线转换结构,最终得到了一个性能最优的转换器,并将其用在后面的整个环行器的设计之中。完成这些工作之后,开始设计一款Ka波段的环行器,最初的结构为Y型三端口对称环行器,在此基础上,设计了一款更易于集成的T型环行器。在设计的基础之上,加工测试了实物器件。最后,从理论上对基片集成波导环行器的失效率进行了分析,得出了其一般失效率计算公式。
[Abstract]:8mm substrate integrated waveguide circulator (Substrate Integrated Waveguide (SIW) is a substrate integrated waveguide circulator with operating wavelength of 8mm. Circulator is an important microwave ferrite device which utilizes the non-reciprocity of ferrite. It is widely used. The TR module, which is mainly used in radar system, is used as the application of interstage isolation. It can also be used as a switching switch for a common antenna, and can switch the state of the signal. A matching load is attached to a port of the circulator and can be used as an isolator. These characteristics of circulator make it an indispensable component in wireless communication system. Traditional circulators include microstrip type and waveguide type. Waveguide circulator has the advantages of high power, high Q value and low insertion loss, but it also has the disadvantage of large volume. The microstrip circulator has some disadvantages such as small size and easy integration, but it also has the disadvantages of low power capacity and so on. With the development of communication technology, there is an urgent need for a circulator with small size and easy integration and high power capacity. In order to study a circulator with the advantages of waveguide type and microstrip line circulator, a new type of guided wave structure-substrate integrated waveguide has been found. This type of guided wave structure is characterized by large power capacity, small volume, easy integration, good high frequency performance and low price. It can be realized by the current LTCC and lithography technology and is suitable for mass production. Moreover, the SIW structure can be easily implemented at design time. Based on these advantages of SIW, we can introduce it into the design of circulator. Based on the above conditions, the structure and transmission characteristics of SIW are studied firstly, and the parameter design method of SIW structure is obtained according to the rectangular waveguide. The influence of SIW structure parameters on its transmission performance is studied by using HFSS software. Then a Ka band SIW structure is designed and the conversion structure from SIW to microstrip line is studied. This structure is different from the general conversion structure. The conic conversion structure is used to obtain a converter with the best performance and is used in the design of the whole circulator. After this work is done, a Ka band circulator is designed. The initial structure is Y type three-port symmetric circulator. On this basis, a T type circulator is designed, which is easier to integrate. On the basis of the design, the physical device is processed and tested. Finally, the failure rate of the substrate integrated waveguide circulator is analyzed theoretically, and the general formula for calculating the failure rate is obtained.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN621

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