Title: | 雙頻濾波器之設計~利用貫孔牆類波導結構 A dual-bandpass filter using via-hole-wall waveguide |
Authors: | 吳宗霖 Zong-Lin Wu 黃瑞彬 Ruey-Bing Hwang 電信工程研究所 |
Keywords: | dual-badnpass filter;higher harmonics;雙頻濾波器;高頻諧波 |
Issue Date: | 2006 |
Abstract: | 本論文提出一個具轉角設計的雙頻濾波器。由於這個轉角的設計,發現在不影響濾波器的雙頻通帶響應下,其高頻諧波響應有將-30dB的抑制,且我們可調整共振腔的長度來控制第二個頻道的頻率。同時,可藉由改變共振腔來得到想要的頻寬。為了證明所提出濾波器有以上的特性,我們實作四個有不同共振腔長度的濾波器,由量測的結果說明,這種有轉角的雙頻濾波器,其高頻諧波平均可以抑制在-25dB以下。 In this thesis, we proposed a planar dual-bandpass filter with bend design. With this bend structure, the higher harmonics response of the proposed dual-bandpass filter can have a suppression of nearly -30dB; meanwhile, the first and the second pass-band specifications remain unchanged. Besides, we found that the second pass-band frequency is tunable by adjusting the length of each cavity. In order to demonstrate the proposed filter performance, four filters with different cavity length were implemented on a low-loss dielectric substrate. In addition to changing the length of each cavity, we changed the aperture length to observe the variation of pass-band bandwidth. From the simulated and measured results, the proposed filter obtains more than -25 dB suppression in average. The measurement shows a very good agreement with simulation. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009313645 http://hdl.handle.net/11536/78459 |
Appears in Collections: | Thesis |
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