線性相位濾波器的研究
發(fā)布時間：2018-08-29 18:57
【摘要】：隨著移動通信技術的迅猛發(fā)展,人們對信息量的需求越來越大,數據傳輸業(yè)務也受到了嚴峻的挑戰(zhàn),僅僅提高傳輸速度已經不能滿足需求,人們對傳輸信號的質量要求也越來越高。濾波器是通信系統(tǒng)中重要的一環(huán),傳輸過程中幅度特性和相位特性均無失真的濾波器可以減小系統(tǒng)的誤碼率,提高系統(tǒng)的傳輸質量。這就使得人們要求濾波器不僅有良好的幅頻響應,在通帶內還要有近似常數的時延特性。因此,線性相位濾波器的研究與設計越來越受到重視。本文以分布參數濾波器理論為基礎,利用線性相位低通原型網絡設計了一款八階LTCC梳狀線帶通線性相位濾波器。濾波器尺寸為2.5mm×3.2mm×1.5mm,通帶頻率從3.5GHz到4.1GHz,通帶內插損小于3dB,回波損耗小于16dB,時延為1.1ns左右,通帶內群時延平坦范圍達到了58.3%。主要通過場的分析方法,分析各諧振級間的耦合情況,然后通過加入相同性質的交叉耦合在復平面的虛軸上產生傳輸零點以達到改善群時延的目的。文中還給出了另外兩個梳狀線線性相位濾波器的設計例子,分別是寬帶帶通線性相位濾波器和高頻帶通線性相位濾波器,通帶內群時延以及群時延平坦范圍分別達到了0.6ns、63.2%和0.8ns、50%。利用仿真軟件HFSS進行模型搭建和仿真優(yōu)化,大大縮短了濾波器的設計周期,十分方便。此外還設計了一款采用環(huán)狀微帶線結構設計的環(huán)狀線性相位濾波器,所選介質基片的相對介電常數為40,厚度為lmm。通過使用ADS軟件,通過路的分析方法,不斷增加諧振級階數改善濾波器的性能。四環(huán)濾波器通帶范圍從8.82GHz至12.25GHz,通帶內群時延為0.258ns,波動范圍小于0.005ns,通帶內群時延平坦范圍為50%。五環(huán)濾波器通帶范圍從10.11GHz至12.75GHz,通帶內群時延為0.258ns,波動范圍小于0.002ns,通帶內群時延平坦范圍為33.3%。
[Abstract]:With the rapid development of mobile communication technology, people need more and more information, and the data transmission service is also facing severe challenges. Only increasing the transmission speed can not meet the demand, and the quality of the transmission signal is becoming more and more demanding. It is required that filters not only have good amplitude-frequency response, but also have approximate constant delay characteristics in the passband. Therefore, the research and design of linear phase filters are paid more and more attention. Based on the theory of digital filter, an eighth-order LTCC comb-line band-pass linear phase filter is designed by using a linear phase low-pass prototype network. The filter size is 2.5mm *3.2mm *1.5mm, the passband frequency is from 3.5GHz to 4.1GHz, the passband interpolation loss is less than 3dB, the return loss is less than 16dB, the delay is about 1.1ns, and the flat range of group delay in the passband is up to 4.1GHz. The result is 58.3%. The coupling between the resonant stages is analyzed mainly by the field analysis method, and then the transmission zeros are generated on the imaginary axis of the complex plane by adding the same cross-coupling to improve the group delay. Linear phase filter and high frequency band-pass linear phase filter can achieve 0.6 ns, 63.2% and 0.8 ns, 50% flat range of group delay in passband, respectively. The designed loop linear phase filter has a dielectric substrate with a relative dielectric constant of 40 and a thickness of lmm. By using ADS software, the performance of the filter is improved by increasing the resonant order continuously. The passband range of the filter is from 8.82 GHz to 12.25 GHz, the group delay in the passband is 0.258 ns, and the fluctuation range is less than 0.005 n. The bandwidth of the five-loop filter ranges from 10.11 GHz to 12.75 GHz, the group delay within the passband is 0.258 ns, the fluctuation range is less than 0.002 ns, and the group delay within the passband is flat in the range of 33.3%.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713
本文編號：2212107
[Abstract]:With the rapid development of mobile communication technology, people need more and more information, and the data transmission service is also facing severe challenges. Only increasing the transmission speed can not meet the demand, and the quality of the transmission signal is becoming more and more demanding. It is required that filters not only have good amplitude-frequency response, but also have approximate constant delay characteristics in the passband. Therefore, the research and design of linear phase filters are paid more and more attention. Based on the theory of digital filter, an eighth-order LTCC comb-line band-pass linear phase filter is designed by using a linear phase low-pass prototype network. The filter size is 2.5mm *3.2mm *1.5mm, the passband frequency is from 3.5GHz to 4.1GHz, the passband interpolation loss is less than 3dB, the return loss is less than 16dB, the delay is about 1.1ns, and the flat range of group delay in the passband is up to 4.1GHz. The result is 58.3%. The coupling between the resonant stages is analyzed mainly by the field analysis method, and then the transmission zeros are generated on the imaginary axis of the complex plane by adding the same cross-coupling to improve the group delay. Linear phase filter and high frequency band-pass linear phase filter can achieve 0.6 ns, 63.2% and 0.8 ns, 50% flat range of group delay in passband, respectively. The designed loop linear phase filter has a dielectric substrate with a relative dielectric constant of 40 and a thickness of lmm. By using ADS software, the performance of the filter is improved by increasing the resonant order continuously. The passband range of the filter is from 8.82 GHz to 12.25 GHz, the group delay in the passband is 0.258 ns, and the fluctuation range is less than 0.005 n. The bandwidth of the five-loop filter ranges from 10.11 GHz to 12.75 GHz, the group delay within the passband is 0.258 ns, the fluctuation range is less than 0.002 ns, and the group delay within the passband is flat in the range of 33.3%.
【學位授予單位】：南京理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN713
【參考文獻】
相關期刊論文 前1條
1 張?zhí)炝?羊愷;羅正祥;補世榮;劉娟秀;寧俊松;;高性能高溫超導線性相位濾波器的研制[J];儀器儀表學報;2007年09期
相關碩士學位論文 前1條
1 李寶山;邊帶陡峭LTCC濾波器的研究與設計[D];南京理工大學;2009年
，本文編號：2212107
本文鏈接：http://sikaile.net/kejilunwen/dianzigongchenglunwen/2212107.html
