雙寬頻帶止濾波器與 寬邊耦合寬頻功率分配器設計;Design of Dual Wideband Bandstop Filter and Broadband Power Divider with Broadside Coupling

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Title:	雙寬頻帶止濾波器與寬邊耦合寬頻功率分配器設計;Design of Dual Wideband Bandstop Filter and Broadband Power Divider with Broadside Coupling
Authors:	劉建志;LIU, CHIEN-CHIH
Contributors:	電機工程研究所
Keywords:	雙頻帶止濾波器;寬邊耦合;等功率分配器;寬頻;Dual-band bandstop filter;Broadside coupling;Equal power divider;Wideband
Date:	2017
Issue Date:	2019-07-17
Publisher:	電機工程研究所
Abstract:	本論文最主要分成兩部分，第一部分探討的是雙寬頻帶止濾波器，從諧振腔的選取出發，並加入集總式元件，使設計的截止頻帶位置更自由，同時藉由調整諧振腔內各傳輸線阻抗大小，電容值大小可選擇想要設計截止頻帶位置、頻寬大小，最後再輸出端、輸入端加入匹配，使此三通帶S11可小於-10 dB，而本次則是設計一個0.6 GHz等絕對頻寬且中心頻率位於2.1 GHz和3.3 GHz。另外，電磁模擬也和量測有很好的一致性。第二部分是第四章節的寬邊耦合寬頻功率分配器，此功率分配器利用強耦合來達到超寬頻的效果，而達到強耦合的方式便是利用混合傳輸線和共平面波導的架構來實現寬邊耦合，之後為達到頻帶外抑制而加入開路殘斷在頻帶外產生零點，此功率分配器操作中心頻率位在2.4 GHz，而實際做出來的頻寬可達88%、，反射損失皆在10dB以下，隔離度小於20dB。 The thesis consists of two parts. The first part is dual wideband bandstop filter. This research starts from the choice of resonators. We try to add lump elements in the resonators in order to design the position of notch band more free. At same time, the value of capacitors and impedances at each transmission line in the resonators can decides the bandwidths and position of notch band. At last, we use impedance matching at the input and output parts in order to let the return loss all better than 10 dB. The center frequency of first band is at 2.1 GHz and second band is at 3.3 GHz. Both absolute bandwidths of the band are 0.6 GHz. The measure has a great agreement with simulation. The second part of this thesis is broadband power divider using broadside coupling. The power divider uses the strong coupling to reach the ultra-wideband (UWB). The strong coupling uses the hybrid microstrip and coplanar waveguide (CPW) structure. After that, we use open stubs to add transmission zeros to suppress the harmonics. Finally the measure result of bandwidth can be 88%. All return loss are better than 10 dB and isolation are better than 20 dB.
Appears in Collections:	[電機工程研究所] 學位論文

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