金屬通孔對於基板合成波導濾波交叉器隔離度的影響;The effect of vias on isolation of the substrate integrated waveguide filtering crossover

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题名:	金屬通孔對於基板合成波導濾波交叉器隔離度的影響;The effect of vias on isolation of the substrate integrated waveguide filtering crossover
作者:	宋浩萱;SUNG, HAO-HSUAN
贡献者:	電機工程學系
关键词:	基板合成波導濾波器;交叉器;金屬通孔;substrate integrated waveguide filter;crossover;vias
日期:	2021-08-16
上传时间:	2021-12-07 13:07:16 (UTC+8)
出版者:	國立中央大學
摘要:	本論文首先透過兩個三階帶通基板合成波導濾波器(Substrate integrated waveguide)通道交叉排列構成交叉器，通過將4個完全相同結構的雙模態共振腔的以及位於中間交疊處的TE_102和TE_201正交簡併模態方腔，並透過佈置於腔體中心的輸入和輸出端口以及耦合窗口，可以成功的實現預期頻寬的通帶傳輸以及出色的隔離度，並且藉由調整饋入線的長寬以及耦合窗口的大小，即可輕鬆控制交叉器的頻寬。緊接著透過將外圍四個雙模態共振腔，調整為TE_101模態與中間共振腔耦合，不僅可以擁有相同的頻寬以及同樣出色的隔離度，調整後的TE_101模態共振腔顯著縮小了電路面積，並且也提高了控制電路頻寬的靈活性。改善隔離度的方法，在本文中是透過將金屬通孔放置在耦合窗口中心，以實現更好的隔離度，並且透過改變金屬通孔的直徑，可發現金屬通孔的直徑大小對於隔離度有相當程度的影響力，接著調整耦合窗口的寬度，以達到在相同的頻寬下做比較，可得出耦合窗口中心放置金屬通孔的電路相較於沒有放置金屬通孔的電路有著更好的隔離度。在本論文中所設計的基板合成波導濾波交叉器，將有其電路設計原理、模擬結果與實作結果探討。 ;In this paper, two third-order substrates waveguide bandpass filter channels are arranged in a cross arrangement used to synthesize the crossover. By combining the four dual-mode resonant cavities which have same structure and the TE_102 and TE_201 orthogonal degenerate mode in the intersecting cavity. The passband transmission with expected bandwidth and excellent isolation can be realized by the input and output ports and the coupling window arranged in the center of the cavity. Adjusting the length and width of the feed line and the width of the coupling window, the bandwidth of the filtering crossover can be easily controlled. Furthermore replacing the four dual-mode resonant cavities to TE_101 mode and couple with the intersecting cavity. Not only can achive the same bandwidth and the same excellent isolation, the TE_101 mode cavity significantly reduces the circuit area, but also improve more flexibly controlled bandwidth. In this article, the vias are placing in the center of the coupling windows in order to improve the isolation. It can be found that changing the diameter of the centered vias has a considerable influence on the isolation, and then it can also be found that the circuit with a centered vias has better isolation compare with a circuit without a centered vias under the same bandwidth, by adjusting the width of the coupling windows to achieve the same conditions. The substrate integrated waveguide filtering crossover designed in this paper ,all the design principles, simulation and measure results of the circuits will be discussed.
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