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    Please use this identifier to cite or link to this item: http://ccur.lib.ccu.edu.tw/handle/A095B0000Q/373


    Title: 高選擇性寬頻帶拒濾波器與吸收式寬頻帶拒濾波器;Design of Wideband Bandstop Filter with High-selectivity and Wideband Absorptive Bandstop Filter
    Authors: 吳承翰;WU, CHENG-HAN
    Contributors: 電機工程研究所
    Keywords: 帶拒濾波器;吸收式帶拒濾波器;集總式有損諧振腔;寬頻;高選擇與高衰減特性;Bandstop filter (BSF);Absorptive bandstop filter (ABSF);Lossy element resonators;Wideband performance;High-selectivity;High-attenuation
    Date: 2017
    Issue Date: 2019-07-17
    Publisher: 電機工程研究所
    Abstract: 本論文主要研究分為兩部份,高選擇性寬頻帶拒濾波器與具寬頻特性之吸收式帶拒濾波器。第二章為濾波器分析理論,將簡單介紹濾波器雛型與設計方法。接著第三章為高選擇性寬頻帶拒濾波器的研究,利用兩種帶拒濾波器特性,分別為使用四分之一波長耦合線且具有L型諧振腔之架構與傳統四分之一波長開路段產生傳輸零點架構做結合,利用高品質因子元件,能有效結合前者的高選擇性效果和後者的寬頻特色,所得到需求的響應特性。更進一步討論此架構不同階數與不同零點位置的設計,所帶來的效果,由ADS軟體進行模擬取得特性結果,且改善頻帶外的通帶特性,經由電磁模擬,在L型諧振腔採用扇形傳輸線做為最終架構,此項微調其目的為降低電路敏感性,章節末段提供設計實例,在衰減量40 dB時頻寬仍能達到14.75 %的頻寬百分比,實做電路尺寸為0.37λg*0.59λg,其中 λg為3 GHz的引導波長(guided wavelength)。第二部分為寬頻吸收式帶拒濾波器,從傳統反射式帶拒濾波器(reflective BSF)出發且架構以四分之一波長耦合線諧振腔設計,中心頻率為3 GHz與吸收頻帶為20 dB的電路雛形,利用集總式元件(lump element)產生有損諧振腔,且探討吸收器的特性,與探討除了增強偶合強度外可使頻寬拓寬的可能性,章節末段提供設計實例,在吸收頻帶可達21.98 %的頻寬百分比且頻帶內RL>19.98 dB,實做電路尺寸為0.19λg*0.56λg。
    For modern wireless communication applications, the researches of filter play an important role since it can have an effect on the sensitivity of communications systems. In this thesis, two parts are presented. The first part is the wideband bandstop filter with high-selectivity at chapter 3. To achieve wideband and high-selectivity performance, a structure of the planar bandstop filter (BSF) with four sections which can control transmission zeros (TZs) to adjust the bandwidth of requiring stop band is presented. We employ two methods to produce the TZs, respectively coupling lines with L-resonators and through lines with open-circuit stubs. The S-parameter decay deeply and quick when the insertion loss next to stop band. And the presented type can replace the conventional type with a quarter wavelength open-ended transmission line resonator. by combine with L-shaped resonators.The second part is the absorptive bandstop filter with wideband performance at chapter 4. The initial design comes from 4-th order reflective BSF, and adds lump elements (resistance) to produce absorptive effect. Use formulas to calculate the impedance match for absorptive part. For improving narrow bandwidth performance, I utilize π-shaped resonators. Finally, two of researches get good performance with simulations.
    Appears in Collections:[電機工程研究所] 學位論文

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