https://scholars.lib.ntu.edu.tw/handle/123456789/121891
標題: | 毫米波單柱雙模共振腔濾波器與
3-D低溫共燒陶瓷雙模環形濾波器 Millimeter-Wave Single-Post Dual-Mode Cavity Filter and 3-D LTCC Dual-Mode Ring Filter |
作者: | 蔡明龍 Tsai, Ming-Lung |
關鍵字: | 微波濾波器;共振腔;雙模濾波器;Cavity;Microwave Filter;Dual-Mode Filter | 公開日期: | 2004 | 摘要: | 摘要 微波濾波器不管是在有線的或無線的微波通訊系統上,都一直扮演著不可或缺的角色,且為了要滿足商業化的應用及需求,因此對於良面積縮小、成本降低、頻帶更窄、品質因素提高等特性規格的需求亦將隨之提昇。本論文將詳細研究兩種應用於毫米波頻段的濾波器架構,並利用商業化之印刷電路板及低溫共燒陶瓷(Low-Temperature Co-fired Ceramics, LTCC)製程來實現濾波器電路製作,詳細討論其設計的理論、過程和頻率響應特性。 第一種所討論的結構為利用基板合成波導技術(Substrate Integrated Waveguide, SIW)來實現的單柱雙模共振腔濾波器,主要是以共振腔為主體,另在共振腔內部的角落處置入一個金屬連通柱(via-post)所構成,此耦合柱可以調整耦合量的多寡,藉以形成雙模共振腔的濾波器,其本身會有兩個傳輸零點(transmission zero)的產生,所以會有很好的頻帶外抑制的效果,本論文將設計一個Ka頻段的雙模共振腔濾波器,藉此詳細探討此種由耦合柱柱子所形成的共振腔型的濾波器,其頻寬、介入損失、反射損失對耦合柱位置的關係,量測結果顯示介入損失小於1.6 dB,反射損失小於15 dB,頻寬小於4.8 %。 其次再探討3-D低溫共燒陶瓷雙模環形濾波器,因為近幾年雙模環形濾波器的電路架構大都是以單層平面結構來實現,此篇論文中我們會提出一個創新的耦合方式,以多層的低溫共燒陶瓷製程來實現,將其饋入信號的微帶線與其環形共振器分別分開在上下兩層金屬層,藉由廣面耦合(broadside coupling)的方式將信號耦合到環形共振器內,利用廣面耦合的結構可以達到縮小面積及容易調整耦合量的優勢,量測結果顯示介入損失小於2 dB,反射損失小於15 dB,頻寬小於8 %。本文最後會討論比較兩種濾波器的優劣好壞,瞭解兩種濾波器實現在毫米波或更高頻段的可行性。 Abstract Microwave filters play an important role on wire and wireless RF/Microwave system applications. For the commercial applications, the filter requirements such as small size, low cost, narrow bandwidth and high quality factors become more and more stringent. In this thesis, two structures of filters suitable for millimeter-wave application are analyzed and implemented on printed circuit boards (PCB) and low-temperature co-fired ceramics (LTCC) process. The filter design theory, design procedure, and frequency response are discussed in detail. The first structure is the single-post dual-mode cavity filter using the substrate integrated waveguide (SIW) techniques. This thesis proposes a new cavity filter structure by introducing the single-post in the cavity resonator. The coupling-post can generate the two coupled resonator modes, which results in two transmission zeros in the filter responses. It has an excellent out-of-band rejection. The SIW filter is designed on Ka-band and measured with 1.6 dB insertion loss, 15 dB return loss, and 4.8% bandwidth. The relations between the insertion loss, return loss and transmission zeros location verse the post location are discussed. The second structure is the 3-D LTCC dual-mode ring filter. In recent years, most dual-mode ring filters are using the planar structures. In this thesis, we propose a new coupling structure to implement dual-mode ring filter on the multi-layer PCB or LTCC process. The feeding signal port and the ring resonator are separated into two different layers. The broadside-coupling structures between the two layers with couple the feeding signal to the ring resonator. Adjusting the overlapped area of broadside-coupling structures, a specific coupling factor at the feeding ports can be easily achieved. The size of 3-D ring filter is smaller than the ring filter using planar structures. Finally, we compare the characteristics of above two filters, and study their feasibility for MMW applications. |
URI: | http://ntur.lib.ntu.edu.tw//handle/246246/58680 | 其他識別: | zh-TW |
顯示於: | 電信工程學研究所 |
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ntu-93-R91942045-1.pdf | 23.31 kB | Adobe PDF | 檢視/開啟 |
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