Cross-Coupled Band-Pass Superconducting Microstrip Filter 曹智濠、王立民
E-mail: 9303429@mail.dyu.edu.tw
ABSTRACT
We have fabricated microstrip band-pass filters based on the quadruplet geometry using high-temperature superconductor. Every half-wave length resonator in the filter consists of loop-like inductor and two patch capacitors at both ends. The inductive coupling in between the loop-like inductors of non-adjacent resonators produces transmission zeros in the frequency response. The transmission zero can be allocated by changing the polarity and the strength of the cross coupling. We have fabricated filters using double-sided YBa2Cu3O7-5 (YBCO) thin films on 20-mm-square LaAlO3 substrates. The filter has 1.925 GHZ center frequency?18MHZ -3dB bandwidth, and 0.13 dB insertion loss at 77K. Due to the transmission zeros near the passband, the steep skirt characteristic is exhibited.
Keywords : cross coupling ; high-temperature superconductor ; sputter ; ybco Table of Contents
封面內頁 簽名頁 授權書...iii 中文摘要...iv 英文摘
要...v 誌謝...vi 目錄...vii 圖目 錄...ix 表目錄...xii 第一章 緒論 1.1 研究背
景...1 1.2 研究動機...2 第二章 濾波器原理 2.1 濾波器基本特
性...3 2.2 S參數之定義與物理意義...4 2.3 共振電路的品質因素...7 2.4 濾波 器形式之簡介...9 第三章 超導體之微波性質 3.1 邁斯納效應與穿透深度...13 3.2 二流體模 型與表面電阻...15 3.3超導體傳輸線特性分析...18 第四章 實驗方法與步驟 4.1 研究架構流 程...25 4.2 交叉耦合式濾波器之原理與設計...26 4.2.1 直接耦合型式與交叉耦合型式濾波器之 差異...26 4.2.2 交叉耦合型式濾波器之設計原理...27 4.2.3 共振器耦合型式...33 4.2.4 交叉耦合型式濾 波器之實際設計...41 4.3 大面積超導薄膜製程...42 4.3.1射頻磁控濺鍍法...42 4.3.2雙離 軸式(off-axis)磁控濺鍍法...43 4.4 製作流程與製程技術...45 4.5 蝕刻方式的選
擇...46 4.6 封裝與量測...47 4.7 共振器空氣層調變量測法...47 第五章 模擬結果與量測結果討論 5.1 濾波器模擬結果...50 5.2 濾波器量測結果...52 5.3 調變共 振器空氣層高度之最佳化結果...55 5.4 單一共振器空氣層高度調變...59 第六章 結
論...69 參考文獻...70 REFERENCES
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