超導與磁性薄膜多層導波結構微波傳播性質之研究

Study of Microwave Propagation Characteristics for Multilayer Waveguides Made of Superconducting/Magnetic Films

趙有民(Yeou-Min Jaw)

國立虎尾科技大學/電機資訊學院/光電與材料科技研究所/碩士(2005年)

摘要

微波通訊儼然已成為目前通訊之主流，聯結整體電路各模組與元件間之導波管或傳輸線對通訊品質具有絕對性之影響，一種可調導波元件可藉具有在高磁場的周邊環境來實現。本論文之前半部先利用基本電磁理論分析由磁性薄膜與介電質構成之多層介質導波管，研究微波於導波管中傳播時衰減情形與相位之變化，具有初步結論後，考慮有外加直流高磁場時所產生之影響，進而瞭解電子自旋波與微波之交互作用。後半部則是更進一步利用超導倫敦方程式（London equation）及二流體模型（Two-fluid model ）分析由高溫超導體（YBCO）薄膜與磁性薄膜(YIG)組成之多層介質導波管，在一般環境與受外加磁場下，微波的衰減與相位變化特性。最後結果可利用電腦數值分析得知，我們並將部分結果與文獻之實際量測結果作一比較。

並列摘要

Microwave communication has become the main stream in modern communication technology. Microwave devices such as waveguides or transmission lines interconnecting modular and components have dominant effects on the transmission quality. A tunable microwave waveguide can be achieved by applying the static magnetic field. In first part of this thesis we use the electromagnetic theory to analyze the propagation characteristics in the multilayer guided structures consisting of magnetic and dielectric thin films. We shall study the frequency- and field-dependent attenuation and phase constants. In addition, the interaction between the spin wave and microwave will also be investigated. In the second part, we shall employ the London equation and two-fluid model for the superconductor to analyze the propagation properties in a multilayer structure waveguide made of a superconductor (YBCO) and magnetic (YIG) films. The numerical results will be analyzed and discussed further. The results will also be compared with the experimental results reported in the literature.

參考文獻

[2] Makoto Tsutsumi, Takeshi Fukusako, and Shigeo Yoshida, “Propagation

Characteristics of the Magnetostatic Surface Wave in the TBCO-YIG Film-Layered

Structure ” IEEE trans. on microwave theorem and techniques, vol. 44, no. 8, aug.

variable spacing planar high-temperature superconducting waveguide in DC magnetic

[4] Chien-Jang Wu, “Propagation characteristics of a thin-film superconducting parallel