小型化介质双工器设计

发布时间：2018-03-12 22:23

本文选题：介质波导腔双工器　切入点：小型化　出处：《电子科技大学》2016年硕士论文　论文类型：学位论文

【摘要】：4G通信技术广泛运用的今天,人们对数据流量业务的需求仍在高速增长。移动通信基站中的小基站对大数据流量业务起着至关重要的作用,其体积小、发射功率小(通常在5~10W)、频谱利用率高的优点相对于宏基站相比越来越突出。小基站则要求微波双工器有更小的体积,因此设计出体积更小、性能更佳的双工器是急切需要的。本文设计了一运用于小基站内的小型化波导腔介质双工器,其最主要特点是:体积只有普通同轴腔双工器的三分之一左右(体积为107?104?12mm3),实现了双工器的小型化。其结构为:在金属波导腔内填充比腔体尺寸略小、介电常数为40的陶瓷介质块,介质块里制作有可供频率调谐的贯穿孔,最后在陶瓷介质块上加一个小聚四氟乙烯环来固定介质块。双工器每一个通道由七个谐振腔组成,腔体之间通过开窗来实现电、磁耦合,每个通道的3、4、5腔组成一个CT结构,从而在TX通带的低端和RX通带的高端分别插入一个传输零点。TX通带的CT结构中的3、5谐振腔使用主模,4谐振腔使用第一高次模,这样的CT结构将产生负的耦合系数实现电耦合。输入端口与TX、RX通带各自的第一个谐振腔的耦合采用了微带分支线直接相连的方式来实现。本文还提出了一种新的调谐方法——基于Q3D Extractor的等效电容调谐法。在原有等效电容调谐法中一直存在无法准确地建立等效电容与调谐螺钉插入深度之间对应关系的问题。新方法通过Q3D Extractor软件直接建立调谐螺钉插入深度与被剖分腔体电容值对应关系的方式解决了上述问题。实际操作中我们建立了螺钉插入深度的变化量与腔体电容变化量之间的对应关系。新调谐方法与原常用的Y矩阵调谐法相比有能大量减小调谐时间,对计算机内存与CPU要求不高,调谐过程直接、简单、易懂等优点。新方法通过一个实例进行了方法说明,其得到了比Y矩阵法更好的初始曲线但时间只用了Y矩阵法的三分之一,证明了其优势。最后进行了介质双工器实物加工、测试与结果分析。
[Abstract]:Today, with the widespread use of 4G communication technology, the demand for data traffic services is still growing at a high speed. The small base stations in mobile communication base stations play an important role in big data's traffic service, and their size is small. The advantages of high spectral efficiency are more and more prominent than those of Acer stations. Small base stations require a smaller volume of microwave duplexers, so they are designed to be smaller. A miniaturized waveguide cavity diplexer with better performance is urgently needed. In this paper, a miniaturized waveguide cavity diplexer for small base stations is designed. Its main feature is that its volume is only about 1/3 of that of a common coaxial cavity duplex (volume is 107? 104? The structure of the device is that the metal waveguide cavity is filled with ceramic dielectric blocks of slightly smaller size than the cavity, and the dielectric constant is 40. In the dielectric blocks, there are perforated holes that can be tuned by the frequency. Finally, a small PTFE ring is added to the ceramic dielectric block to fix the dielectric block. Each channel of the duplex consists of seven resonators, and the electric and magnetic coupling is achieved by opening windows between the cavities. Thus, at the low end of the TX passband and at the high end of the RX passband, respectively, the 3P5 resonator in a CT structure of the transmission 00:00. TX passband uses the first higher mode using the main mode 4 resonator, which is inserted at the lower end of the TX passband and the high end of the RX passband, respectively. The coupling between the input port and the first resonator of the TX RX passband is realized by the direct connection of the microstrip branch line. The tuning method based on Q3D Extractor is an equivalent capacitance tuning method. In the original equivalent capacitance tuning method, the corresponding relationship between the equivalent capacitance and the insertion depth of the tuning screw can not be established accurately. The new method is adopted by Q3D Extractor. The software directly establishes the relationship between the insertion depth of the tuning screw and the capacitance value of the dissected cavity, and solves the above problem. In practical operation, we have established the pair between the change of the insertion depth of the screw and the change of the capacitance of the cavity. The new tuning method can greatly reduce the tuning time compared with the usual Y matrix tuning method. The advantages of computer memory and CPU are not high, the tuning process is direct, simple, easy to understand and so on. The new method is illustrated by an example. The initial curve is better than the Y matrix method, but the time is only 1/3 of the Y matrix method, which proves its advantage. Finally, the material processing of the dielectric duplex is carried out, and the results are analyzed and tested.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TN631.2

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