本文選題：梳狀基片集成波導(dǎo) + 周期結(jié)構(gòu)��； 參考：《西安電子科技大學(xué)》2015年碩士論文

【摘要】：在無(wú)線通信系統(tǒng)的射頻前端中,濾波器是其不可或缺的重要組成部分,其性能對(duì)整個(gè)射頻系統(tǒng)的指標(biāo)影響很大。超寬帶通信系統(tǒng)擁有極寬的頻譜寬度,并且具有功率損耗低、抗干擾性能高、保密性好、傳輸速率高等突出優(yōu)勢(shì)。因此,研制出應(yīng)用于超寬帶通信系統(tǒng)的高性能濾波器具有重要的意義�；刹▽�(dǎo)(substrate integrated waveguide,SIW)因其獨(dú)特的結(jié)構(gòu)優(yōu)勢(shì)和電磁特性,受到了廣泛的關(guān)注。但是SIW結(jié)構(gòu)由于金屬通孔的存在,仍存在一些不足:金屬通孔的加工誤差較大;隨著介質(zhì)基板厚度的增加,打孔工藝?yán)щy;金屬通孔使其上下金屬層相互連接,導(dǎo)致該結(jié)構(gòu)很難與有源芯片或有源電路集成等。近年來(lái),一些學(xué)者致力于探索SIW的改進(jìn)結(jié)構(gòu),而梳狀基片集成波導(dǎo)(corrugated substrate integrated waveguide,CSIW)的提出,就是為了解決打孔結(jié)構(gòu)帶來(lái)的負(fù)面影響。CSIW結(jié)構(gòu)可以看作是在SIW的結(jié)構(gòu)基礎(chǔ)上去掉打孔結(jié)構(gòu),然后在其上下金屬層的兩側(cè)沿電磁波的傳播方向設(shè)計(jì)出等間距排列的長(zhǎng)度為四分之一波長(zhǎng)的梳狀微帶線即可,簡(jiǎn)化了加工工藝。本文主要研究基于CSIW技術(shù)的超寬帶帶通濾波器的設(shè)計(jì),將CSIW與缺陷地(DGS)結(jié)構(gòu)、電磁帶隙(EBG)結(jié)構(gòu)相結(jié)合,分別設(shè)計(jì)了一種CSIW-DGS超寬帶帶通濾波器和CSIW-EBG超寬帶帶通濾波器,證實(shí)了CSIW用于超寬帶濾波器設(shè)計(jì)的可行性。首先,介紹了CSIW的分析方法及設(shè)計(jì)原則;與SIW作對(duì)比,分析了CSIW的結(jié)構(gòu)特點(diǎn)和電磁特性。其次,說(shuō)明了本文中DGS與EBG的構(gòu)成方法;給出了用于構(gòu)成DGS與EBG的周期結(jié)構(gòu)單元的等效電路模型;分析了各個(gè)參數(shù)對(duì)周期單元電磁特性的影響。最后,提出了一種性能良好的錐形CSIW-微帶轉(zhuǎn)換器,在此基礎(chǔ)上,將具有復(fù)雜幾何形狀的二維周期結(jié)構(gòu)分別蝕刻在CSIW的下表面金屬層和上表面金屬層,構(gòu)造出DGS結(jié)構(gòu)與EBG結(jié)構(gòu),設(shè)計(jì)出CSIW-DGS超寬帶濾波器和CSIW-EBG超寬帶濾波器;通過(guò)仿真優(yōu)化,確定了兩款濾波器的最終尺寸;根據(jù)設(shè)計(jì)結(jié)果對(duì)這兩款濾波器進(jìn)行了加工、測(cè)試,仿真結(jié)果與測(cè)試結(jié)果均表明本文設(shè)計(jì)的兩款濾波器具有頻帶寬、損耗小、濾波性能好等特點(diǎn)。
[Abstract]:In the RF front-end of wireless communication system, filter is an indispensable part of the RF system, and its performance has a great impact on the whole RF system. UWB communication system has the advantages of wide spectrum width, low power loss, high anti-jamming performance, good confidentiality and high transmission rate. Therefore, it is of great significance to develop high performance filters for UWB communication systems. Substrate integrated waveguide SIW (substrate integrated waveguide SIW) has attracted wide attention due to its unique structural advantages and electromagnetic properties. However, due to the existence of metal through holes, SIW structure still has some shortcomings: the machining error of metal through holes is large; with the increase of the thickness of dielectric substrate, the drilling process is difficult; the metal through holes make the upper and lower metal layers connect to each other. As a result, it is difficult to integrate with active chip or active circuit. In recent years, some scholars have devoted themselves to exploring the improved structure of SIW, and the comb substrate integrated waveguide corrugated substrate integrated waveguide.CSIW can be regarded as removing the perforating structure from the structure of SIW. Then the comb-like microstrip line with equal distance of 1/4 wavelength arranged along the propagation direction of electromagnetic wave is designed on both sides of the upper and lower metal layer, which simplifies the processing technology. This paper mainly studies the design of ultra-wideband bandpass filter based on CSIW technology. Combining CSIW with defective CSIW structure and electromagnetic bandgap structure, a kind of CSIW-DGS ultra-wideband bandpass filter and CSIW-EBG ultra-wideband band-pass filter are designed, respectively. The feasibility of using CSIW to design UWB filter is confirmed. Firstly, the analysis method and design principle of CSIW are introduced, and compared with SIW, the structure and electromagnetic characteristics of CSIW are analyzed. Secondly, the construction method of DGS and EBG in this paper is explained, the equivalent circuit model of the periodic structure unit used to make up DGS and EBG is given, and the influence of each parameter on the electromagnetic characteristics of the periodic unit is analyzed. Finally, a conical CSIW- microstrip converter with good performance is proposed. On the basis of this, the two-dimensional periodic structure with complex geometry is etched on the lower surface metal layer and the upper surface metal layer of CSIW, respectively, and the DGS structure and the EBG structure are constructed. The CSIW-DGS UWB filter and the CSIW-EBG UWB filter are designed. The final size of the two filters is determined by simulation and optimization. The two filters are processed and tested according to the design results. The simulation results and the test results show that the two filters designed in this paper have the advantages of low frequency bandwidth, low loss and good filtering performance.
【學(xué)位授予單位】：西安電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TN713

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 官雪輝;陳鵬;劉海文;蔡鵬;;超寬帶濾波器的研究現(xiàn)狀與進(jìn)展[J];華東交通大學(xué)學(xué)報(bào);2011年01期

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本文編號(hào)：1974147