本文選題：三頻微帶　切入點：階梯阻抗諧振器　出處：《西安電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：在科技日新月異發(fā)展的今天,現(xiàn)代無線和移動通信系統(tǒng)以前所未有的速度影響和改善我們的生活的同時,對我們提出更高更迫切的要求。作為通信系統(tǒng)的關鍵組成部分,具有多頻帶的射頻前端濾波器是實現(xiàn)通信系統(tǒng)多頻功能的主要途徑。新型無線通信協(xié)議如WLAN、WiMAX、LTE、WCDMA等的提出及應用,也使得微型化、插入損耗低、矩形系數(shù)高的高性能濾波器成為研究設計的熱點。本文研究對象為工作在WLAN和WiMAX頻段的三頻帶通濾波器,并討論了濾波器設計中常用的諧振器,在此基礎上發(fā)揮創(chuàng)造力,成功設計出兩款微帶三頻帶通濾波器。首先,本文總結了近幾年來三頻帶通濾波器的研究成果,并對多通帶濾波器的實現(xiàn)方法進行了簡要的介紹。其次,對四分之一波長階梯阻抗諧振器(SIR)的結構和諧振原理進行了分析,并在此基礎上構造出三頻濾波器的第一通帶。接著簡要介紹了開路枝節(jié)加載諧振器(OSLR)的結構及其諧振原理,并在此基礎上構造雙通帶濾波器。根據OSLR的奇偶模諧振原理,將奇模諧振響應作為第二通帶,偶模諧振響應作為第三通帶。為實現(xiàn)系統(tǒng)小型化,將半波長OSLR彎折成“?”形,通過電耦合方式與四分之一波長型SIR耦合,采用0度饋電結構對濾波器進行饋電,實現(xiàn)三個通頻帶的目的。為改善濾波器的性能,在其輸入輸出饋電端加載開路枝節(jié)線,成功構造出五個衰減大于33dB傳輸零點,分別位于2.02GHz、2.85GHz、3.01GHz、4.0GHz及5.9GHz處。經過HFSS的優(yōu)化仿真,在整體尺寸為0.28 0.08g g???的基礎上實現(xiàn)三頻帶功能,其三個通帶中心頻率分別為2.4GHz、3.5GHz、5.2GHz,插入損耗為0.44dB、0.64dB、0.34dB,3d B相對帶寬為11.7%、9.7%、9.1%。最后,對半波長SIR的結構和諧振原理進行了分析,并在此基礎上,利用兩個C型半波長SIR構造第一、第三通帶。用四分之一波長型SIR構造第二通帶。將第二通帶耦合到第一、第三通帶間,達到三頻帶的目的。用零度饋電結構構造傳輸零點,獲得更好的回波損耗。在整體尺寸為0.214 0.112g g???的基礎上實現(xiàn)了濾波器的三頻帶功能,其三個通帶中心頻率分別為2.4GHz、3.5GHz和5.2GHz,插入損耗為2.19dB、0.21dB和1.92dB,相對帶寬為11.3%、8%和3.5%。
[Abstract]:Today, with the rapid development of science and technology, modern wireless and mobile communication systems affect and improve our lives at an unprecedented speed, while putting forward higher and more urgent demands on us as a key component of the communication system. RF front-end filter with multi-frequency band is the main way to realize the multi-frequency function of communication system. New wireless communication protocols such as WLAN WiMAX / LTEN WCDMA and so on, also make them miniaturized, and the insertion loss is low. High-performance filters with high rectangular coefficients have become a hot topic in the research and design. This paper focuses on three-band pass filters working in the WLAN and WiMAX bands, and discusses the resonators commonly used in the design of filters. Two microstrip three-band pass filters are successfully designed. Firstly, this paper summarizes the research results of three-band pass filters in recent years, and gives a brief introduction to the implementation of multi-pass filters. The structure and resonant principle of 1/4 wavelength stepped impedance resonator are analyzed, and the first pass band of three-frequency filter is constructed. Then, the structure and resonant principle of open-loop loaded resonator OSLR are briefly introduced. According to the odd-even mode resonance principle of OSLR, the odd-mode resonance response is regarded as the second pass band and the even-mode resonant response as the third pass band. In order to realize the miniaturization of the system, the half-wavelength OSLR is bent into "? In order to improve the performance of the filter, an open-circuit branch line is loaded at the input and output feed end to improve the performance of the filter by using the 0-degree feed structure to feed the filter with the 1/4 wavelength SIR. Five attenuation above 33dB transmission 00:00 were successfully constructed at 2.01GHz 4.0GHz and 5.9GHz at 2.02GHz ~ 2.85GHz respectively. The overall size of the transmission is 0.280.08g? ? ? The three-band function is realized on the basis of the three-band function. The three passband center frequencies are 2.4GHz / 3.5GHz and 5.2GHz, respectively, and the insertion loss is 0.44dBN 0.64dBN 0.34dBU / 3dB relative bandwidth is 11.7dB / 9.70.The structure and resonant principle of half-wavelength SIR are analyzed, and the resonant principle is analyzed. Using two C-type half-wavelength SIR to construct the first and third pass band, and using the 1/4 wavelength type SIR to construct the second pass band. The second pass band is coupled to the first and the third pass band to achieve the purpose of three frequency bands. The transmission 00:00 is constructed by using the zero feed structure. A better return loss is obtained. The overall size is 0. 214 0. 1 12 g? ? ? The three bandpass center frequencies are 2.4 GHz and 5.2 GHz, respectively. The insertion loss is 2.19 dB 0.21 dB and 1.92 dB, and the relative bandwidth is 11.3% and 3.5%.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713.5

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