【摘要】：微波帶阻濾波器廣泛應(yīng)用于無(wú)線通信以及測(cè)試等系統(tǒng),其主要作用是在所需要的頻段內(nèi)產(chǎn)生抑制,以達(dá)到濾除摻雜在有用信號(hào)中的干擾信號(hào)的目的。隨著無(wú)線通信技術(shù)的發(fā)展,對(duì)帶阻濾波器的性能要求越來越高,于是體積更小、矩形系數(shù)更好、損耗更低的微波帶阻濾波器成為了研究的重點(diǎn)之一。本論文主要研究了微波帶阻濾波器的基本設(shè)計(jì)原理、結(jié)構(gòu)以及其實(shí)現(xiàn),結(jié)合圓柱形介質(zhì)諧振器,引入交叉耦合的概念,以腔體帶阻濾波器作為研究對(duì)象,設(shè)計(jì)了三個(gè)帶阻濾波器,其主傳輸線都是同軸結(jié)構(gòu)。主要內(nèi)容如下：1.介紹了一般窄帶帶阻濾波器的設(shè)計(jì)原理,給出了設(shè)計(jì)公式,根據(jù)設(shè)計(jì)公式設(shè)計(jì)了一個(gè)應(yīng)用于手機(jī)雜散測(cè)試系統(tǒng)的窄帶帶阻濾波器,其階數(shù)為五階,中心頻率為1.95GHz,阻帶頻段為1.9475GHz～1.9525GHz,阻帶抑制達(dá)到30dB,諧振單元為金屬桿。2.介紹了圓柱形介質(zhì)諧振器的基本理論,使用MATLAB軟件編程求解所需要的諧振器的尺寸,結(jié)合帶阻濾波器的設(shè)計(jì)方法,結(jié)合HFSS軟件設(shè)計(jì)了一個(gè)五階介質(zhì)帶阻濾波器,中心頻率為5GHz,阻帶頻段為4.96GHz～5.04GHz,阻帶抑制為35dB。3.介紹了交叉耦合濾波器的原理以及耦合矩陣的提取方法,使用MATLAB軟件編程得到耦合矩陣,結(jié)合HFSS軟件設(shè)計(jì)了一個(gè)四階介質(zhì)帶通濾波器,中心頻率為4.99GHz,3dB帶寬為60MHz,回波損耗大于20dB,傳輸零點(diǎn)分別為4.9GHz和5.1GHz。在帶通濾波器的基礎(chǔ)上得到帶阻濾波器的耦合矩陣,并使用MATLAB軟件編程來求取,結(jié)合HFSS軟件設(shè)計(jì)了一個(gè)四階介質(zhì)帶阻濾波器,中心頻率為4.965GHz,阻帶頻段為4.93GHz～5.00GHz,阻帶抑制大于等于15dB,反射零點(diǎn)頻率為4.83GHz和5.1GHz。
[Abstract]:Microwave band-stop filters are widely used in wireless communication and testing systems. The main function of microwave bandstop filters is to suppress the interference signals in the required frequency band, so as to filter the interference signals doped in useful signals. With the development of wireless communication technology, the performance of band-stop filter is becoming more and more high, so the microwave band-stop filter with smaller size, better rectangular coefficient and lower loss has become one of the emphases of the research. In this paper, the basic design principle, structure and realization of microwave band-stop filter are studied. Combined with cylindrical dielectric resonator, the concept of cross-coupling is introduced, and the band-stop filter of cavity is taken as the research object. Three bandstop filters are designed and their main transmission lines are coaxial. The main contents are as follows: 1. The design principle of general narrow band stop filter is introduced, and the design formula is given. According to the design formula, a narrow band stop filter applied to mobile phone stray testing system is designed. Its order is five, and the center frequency is 1.95 GHz. The stopband band is 1.9475GHz ~ (-1) 9525GHz, the stopband suppression is 30 dB, and the resonant element is a metal rod. 2. The basic theory of cylindrical dielectric resonator is introduced in this paper. The size of the resonator is solved by using MATLAB software. Combined with the design method of band-stop filter and HFSS software, a five-order dielectric band-stop filter is designed with a center frequency of 5 GHz. The stopband band is 4.96 GHz ~ 5.04 GHz, and the stopband suppression is 35 dB.3. The principle of cross coupling filter and the method of extracting coupling matrix are introduced. The coupling matrix is obtained by using MATLAB software. A fourth order dielectric band-pass filter is designed with HFSS software. The center frequency is 4.99 GHz ~ (3 dB) and the bandwidth is 60 MHz. The echo loss is greater than 20 dB and the transmission zeros are 4.9GHz and 5.1 GHz, respectively. Based on the bandpass filter, the coupling matrix of the band-stop filter is obtained, and a fourth-order dielectric band-stop filter is designed by using MATLAB software. The center frequency is 4.965 GHz, and the stopband band is 4.93 GHz ~ 5.00 GHz. The stopband suppression is greater than 15 dB and the reflection zero frequency is 4.83GHz and 5.1 GHz.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713.5

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本文編號(hào)：2420839