本文選題：介質(zhì)波導(dǎo)腔雙工器　切入點：小型化　出處：《電子科技大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：4G通信技術(shù)廣泛運(yùn)用的今天,人們對數(shù)據(jù)流量業(yè)務(wù)的需求仍在高速增長。移動通信基站中的小基站對大數(shù)據(jù)流量業(yè)務(wù)起著至關(guān)重要的作用,其體積小、發(fā)射功率小(通常在5~10W)、頻譜利用率高的優(yōu)點相對于宏基站相比越來越突出。小基站則要求微波雙工器有更小的體積,因此設(shè)計出體積更小、性能更佳的雙工器是急切需要的。本文設(shè)計了一運(yùn)用于小基站內(nèi)的小型化波導(dǎo)腔介質(zhì)雙工器,其最主要特點是:體積只有普通同軸腔雙工器的三分之一左右(體積為107?104?12mm3),實現(xiàn)了雙工器的小型化。其結(jié)構(gòu)為:在金屬波導(dǎo)腔內(nèi)填充比腔體尺寸略小、介電常數(shù)為40的陶瓷介質(zhì)塊,介質(zhì)塊里制作有可供頻率調(diào)諧的貫穿孔,最后在陶瓷介質(zhì)塊上加一個小聚四氟乙烯環(huán)來固定介質(zhì)塊。雙工器每一個通道由七個諧振腔組成,腔體之間通過開窗來實現(xiàn)電、磁耦合,每個通道的3、4、5腔組成一個CT結(jié)構(gòu),從而在TX通帶的低端和RX通帶的高端分別插入一個傳輸零點。TX通帶的CT結(jié)構(gòu)中的3、5諧振腔使用主模,4諧振腔使用第一高次模,這樣的CT結(jié)構(gòu)將產(chǎn)生負(fù)的耦合系數(shù)實現(xiàn)電耦合。輸入端口與TX、RX通帶各自的第一個諧振腔的耦合采用了微帶分支線直接相連的方式來實現(xiàn)。本文還提出了一種新的調(diào)諧方法——基于Q3D Extractor的等效電容調(diào)諧法。在原有等效電容調(diào)諧法中一直存在無法準(zhǔn)確地建立等效電容與調(diào)諧螺釘插入深度之間對應(yīng)關(guān)系的問題。新方法通過Q3D Extractor軟件直接建立調(diào)諧螺釘插入深度與被剖分腔體電容值對應(yīng)關(guān)系的方式解決了上述問題。實際操作中我們建立了螺釘插入深度的變化量與腔體電容變化量之間的對應(yīng)關(guān)系。新調(diào)諧方法與原常用的Y矩陣調(diào)諧法相比有能大量減小調(diào)諧時間,對計算機(jī)內(nèi)存與CPU要求不高,調(diào)諧過程直接、簡單、易懂等優(yōu)點。新方法通過一個實例進(jìn)行了方法說明,其得到了比Y矩陣法更好的初始曲線但時間只用了Y矩陣法的三分之一,證明了其優(yōu)勢。最后進(jìn)行了介質(zhì)雙工器實物加工、測試與結(jié)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.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN631.2

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本文編號：1603544