發(fā)布時間：2018-08-07 16:04

【摘要】：在無線技術(shù)迅猛發(fā)展的今天,人們對射頻器件的指標要求越來越高。不僅需要通帶低插損,阻帶高衰減,由于頻段的擁擠,對濾波器邊緣選擇性的也有很高的要求。另外,在競爭日益激烈的通信行業(yè)中,對濾波器體積的小型化也是一項重要的工作。由于現(xiàn)在多種通信標準并行,對于多頻器件的研究是社會發(fā)展趨勢的要求。而帶阻濾波器作為通信系統(tǒng)中一個不可或缺的器件,對其進行透徹的研究具有重要的意義。本文將結(jié)合當代對射頻濾波器的主要指標要求,對多頻帶阻濾波器展開細致的研究,目標在于提出新型的設(shè)計方法,相比于已有的多頻帶阻濾波器,在性能上做出較大的提升,以滿足更高的實際要求。本文的主要工作有以下幾點:1、研究并設(shè)計性能優(yōu)異的三頻帶通濾波器。對于多頻濾波器,主要的設(shè)計思路是使用支節(jié)線加載諧振器(SLR)或階躍阻抗諧振器(SIR)。這兩種諧振器以前多用于雙頻濾波器的設(shè)計中。文章對這兩種諧振器做詳細研究,并將其用于三頻帶通濾波器的設(shè)計中,目標在于實現(xiàn)良好的帶內(nèi)帶外性能,并具有較大的可調(diào)范圍。文章首先對諧振器的工作原理進行分析,隨后通過全波仿真軟件對所設(shè)計的濾波器進行仿真和優(yōu)化,同時給出設(shè)計參數(shù)曲線圖。最后我們對設(shè)計的濾波器進行加工和測試。仿真和測試的結(jié)果相吻合,證明了分析方法和設(shè)計方法的正確性。我們將該成果發(fā)表于期刊Micorwave and Optical Technology Letters。2、研究混合電磁耦合的原理及其在濾波器設(shè)計中的應(yīng)用。傳統(tǒng)腔體濾波器經(jīng)常通過交叉耦合產(chǎn)生傳輸零點,但交叉耦合受限于刻板的拓撲結(jié)構(gòu),對應(yīng)用造成不便。我們發(fā)現(xiàn)通過電磁混合耦合同樣可以在帶外產(chǎn)生傳輸零點,從而可以作為一個優(yōu)秀的替代品。我們使用階躍結(jié)構(gòu)的耦合窗口,引入可控的電磁混合耦合,設(shè)計了一個腔體帶通濾波器。同時,我們加入螺旋饋電結(jié)構(gòu),使得外部品質(zhì)因數(shù)的可調(diào)范圍大大增加。這兩種結(jié)構(gòu)我們均提供了詳細的設(shè)計參數(shù)圖表。該成果發(fā)表于期刊IEEE Microwave and Wireless Component Letters。3、研究多頻帶通濾波器在多頻雙工器和三工器中的應(yīng)用。在雙工器和三工器的設(shè)計中,各個通道的隔離取決于匹配網(wǎng)絡(luò)的設(shè)計。若各個通道能實現(xiàn)獨立控制,則會為設(shè)計帶來很大的方便。我們使用開路支節(jié)線和短路支節(jié)線設(shè)計了一個新型匹配網(wǎng)絡(luò),能方便地支持多個通道。文中給出了系統(tǒng)的設(shè)計過程,并對最終設(shè)計出的雙工器和三工器進行加工和測試,測試結(jié)果與仿真結(jié)果相吻合。該成果發(fā)表于期刊IEEE Microwave and Wireless Component Letters。
[Abstract]:With the rapid development of wireless technology, people demand higher and higher standards of RF devices. Not only the low insertion loss of passband and high attenuation of stopband are required, but also the edge selectivity of filter is very high due to the crowding of frequency band. In addition, the miniaturization of filter size is also an important task in the increasingly competitive communications industry. Due to the parallelism of many communication standards, the research of multi-frequency devices is the requirement of social development. As an indispensable device in communication system, it is of great significance to study the band-stop filter thoroughly. In this paper, according to the main requirements of the modern RF filter, a detailed study on the multi-band resistive filter will be carried out. The aim is to propose a new design method. Compared with the existing multi-band resistive filter, the performance of the multi-band resistive filter will be greatly improved. To meet higher practical requirements. The main work of this paper is as follows: 1. Research and design three-band pass filter with excellent performance. For multi-frequency filter, the main design idea is to use branch line to load resonator (SLR) or step impedance resonator (SIR). These two resonators were used in the design of dual frequency filters. In this paper, the two kinds of resonators are studied in detail and used in the design of three-band pass filters. The goal is to achieve good in-band and out-of-band performance and have a large adjustable range. In this paper, the working principle of the resonator is analyzed, then the filter is simulated and optimized by full-wave simulation software, and the curve of design parameters is given. Finally, we process and test the designed filter. The results of simulation and test are in agreement with each other, which proves the correctness of the analysis method and the design method. We publish this work in the journal Micorwave and Optical Technology Letters.2.We study the principle of hybrid electromagnetic coupling and its application in filter design. Traditional cavity filters often generate transmission zeros by cross-coupling, but cross-coupling is limited by the stereotype topology, causing inconvenience to applications. We find that the transmission zeros can also be generated by electromagnetic hybrid coupling, which can be used as an excellent substitute. A cavity band-pass filter is designed by using the coupling window of the step structure and the controllable electromagnetic hybrid coupling. At the same time, the adjustable range of external quality factor is greatly increased by adding helical feed structure. We provide detailed design parameter diagrams for both structures. The study, published in the journal IEEE Microwave and Wireless Component Letters.3, studies the application of multi-band pass filters in multi-frequency duplex and triplexer. In the design of duplex and triplexer, the isolation of each channel depends on the design of matching network. If each channel can achieve independent control, it will bring great convenience to the design. We design a new matching network using open branch and short circuit branch, which can support multiple channels conveniently. The design process of the system is given, and the final duplex and triplexer are machined and tested. The test results are in agreement with the simulation results. The results are published in the journal IEEE Microwave and Wireless Component Letters.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TN713

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