Analysis of Superconducting Microwave Transmission Lines (REU SUPPLEMENT)

超导微波传输线分析（REU 补充）

• 批准号: 9108933
• 负责人: Samir El-Ghazaly
• 金额: $ 7万
• 依托单位: Arizona State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-08-15 至 1994-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9108933&HistoricalAwards=false
• 关键词: Analysis; Superconducting; Microwave; Transmission; Lines

Incorporating High Tc Superconducting (HTS) materials in planar transmission lines is very promising for high speed digital, and high frequency analog applications. Before full exploitation of the HTS's, their current and power handling capacities need to be assessed. Knowing the material critical current density does not directly lead to the maximum current that can be carried by the transmission line. In this Research Initiation Award, London's equations and the two-fluid model will be used to investigate the current distributions on HTS transmission lines. They will be coupled with one of two electromagnetic models. The first on is a full-wave analysis. The developed equations are discretized over the structure cross-section in a two dimensional mesh using the finite-difference scheme. The total current carried by an HTS microstrip line without exceeding the critical current density of the material as well as the total power can be calculated. The losses due to normal electrons and the Q-factor are directly obtained. We have already performed initial calculations, and the preliminary results are very encouraging. We here propose to fully develop the model by incorporating substrate losses and non-linear conductivity. Then, the fully developed models will be used for comprehensive analysis of HTS microstrip lines. Design guidelines for microwave superconducting planar transmission lines will be developed. Comparative study between different planar transmission lines will be performed to select the best structure that fully exploits HTS capabilities.

在平面传输线中采用高温超导 (HTS) 材料对于高速数字和高频模拟应用非常有前景。 在充分利用高温超导系统之前，需要对其电流和功率处理能力进行评估。 知道材料的临界电流密度并不能直接得出传输线可以承载的最大电流。 在本次研究启动奖中，伦敦方程和二流体模型将用于研究高温超导输电线路上的电流分布。 它们将与两个电磁模型之一相结合。 第一个是全波分析。 使用有限差分格式将所开发的方程离散化为二维网格中的结构横截面。 可以计算高温超导微带线在不超过材料临界电流密度的情况下承载的总电流以及总功率。 直接获得因正常电子和 Q 因子引起的损耗。 我们已经进行了初步计算，初步结果非常令人鼓舞。 我们在此建议通过纳入基板损耗和非线性电导率来全面开发该模型。 然后，完全开发的模型将用于高温超导微带线的综合分析。 将制定微波超导平面传输线的设计指南。 将进行不同平面传输线之间的比较研究，以选择充分发挥高温超导能力的最佳结构。