https://scholars.lib.ntu.edu.tw/handle/123456789/123103
Title: | 應用於封裝中之新型人工開槽式接地面結構的射頻濾波器設計 A Novel Artificial Defected Ground Structure (DGS) for RF Filter Design in Package |
Authors: | 許育豪 Hsu, Yu-Hao |
Keywords: | 開槽式接地面結構(defected ground structure, DGS);蕈狀結構(mushroom structure);縮小化;電磁輻射(electromagnetic interference, EMI);多層板;defected ground structure (DGS);mushroom;miniaturization;size reduction;Electromagnetic interference (EMI);multilayer. | Issue Date: | 2010 | Abstract: | 本論文提出一種新型且適用於多層結構中的開槽式接地面結構(defected ground structure, DGS)。這種結構是在傳統的開槽式接地面下放入蕈狀結構(mushroom structure)。利用蕈狀結構提供的慢波特性,可以針對開槽式接地面結構作縮小化。同時在開槽式接地面結構下提供完整的金屬屏蔽,降低開槽式接地面結構的輻射,並減少對其他信號的干擾。為了設計這種新型的開槽式接地面結構,文中介紹了傳輸線的模型來幫助設計。在所提出的傳輸線模型當中,考慮到開槽線非理想的接地效應,進而對理論的計算結果作修正。藉由此傳輸線模型,可以直接計算出所需結構的尺寸。文中提出了兩種開槽式接地面結構的應用─帶止濾波器和帶通濾波器。為了有效的比較新型的開槽式接地面結構和傳統的不同,本文利用兩種形狀的開槽式形狀來設計帶止濾波器─長條型和啞鈴型開槽式形狀,前者為了探究慢波的特性,後者為了探究特徵阻抗的改變。和傳統的開槽式接地面結構相比,前者所設計的帶止濾波器縮小了21.2%,後者則減少了28.7%的面積。文中的帶通濾波器由四個共振腔組成,在同樣的濾波器規格下,利用新型的開槽式接地面結構所形成的共振腔大小,只有傳統的53.2%,整體大小縮小了29.7%。藉由天線無反射室的量測,可以發現新型開槽式接地面結構能夠有效的降低輻射。在帶止濾波器的應用中,和傳統的開槽式接地面結構相比較,新型的開槽式接地面結構所量測到的輻射降低了5dB,而帶通濾波器則減少了10dB。本文提出了一種適用於多層結構中並同時有效降低輻射和縮小化的開槽式接地面結構,並利用帶止濾波器和帶通濾波器作驗證。 A novel defected ground structure (DGS) in a multilayer stack-up is proposed. This structure is a defected ground plane with mushroom structures (DGMS). The proposed structure provides a relatively compact size and low radiation and is suitable for multilayer applications. A design method using a transmission line model is introduced to predict the physical size of a DGS-type resonator. In this model, the short-end effect is considered to modify the theoretical calculation. Band-stop filters and coupled-resonator band-pass filters are fabricated with DGS-type resonators in a multilayer structure. There are two kinds of band-stop filter with rectangular- and dumbbell-shape DGS-type resonators. Compared with the conventional DGS, the band-stop filter with DGMS can reduce about 21.2% and 28.7% for band-stop filter with rectangular- and dumbbell-shape DGS-type resonators. For coupled-resonator band-pass filters, the size reduction of DGMS resonators is about 46.8% and the total size reduction of the band-pass filter is about 29.7% in contrast with the conventional DGS. The radiation can be reduced about 5dB and 10 dB for the band-stop filter and the band-pass filter. The proposed structure with miniature size and low radiation is suitable for multilayer applications. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/253264 |
Appears in Collections: | 電信工程學研究所 |
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ntu-99-R97942018-1.pdf | 23.32 kB | Adobe PDF | View/Open |
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