HTS薄膜微波Jc与频率依赖关系的微桥谐振器测量方法研究

It is of great significance to establish a method for accurately measuring the dependence of microwave Jc and frequency in HTS thin films, both for the development of HTS microwave devices and for the exploration of the microwave nonlinear mechanism of HTS. In the design process of HTS microwave filter and limiter, it is needed to determine the power handling capacity and limiting power by accurate microwave Jc parameters. In the study of the nonlinear mechanism of HTS microwave, accurate data is needed to provide theoretical support for exploration. At present, there is a problem that the accuracy of measurement of the microwave Jc and the frequency dependence is insufficient, and the reliability of the data is degraded, caused by the difference between sapmples. Therefore, this research is based on the different resonance modes\frequency of micro-bridge resonators. The main innovations are as follows: (1) The establishment of microwave Jc and readable test parameters analytical relational model, under various resonant modes/frequency of micro-bridge resonators ; (2) Construct a structure that can achieve continuous tuning the external coupling, to improve energy utilization and reduce complexity. Combining the mentioned above research with the methods for testing intermediate parameters, based on the scientific planning of the entire test plan and process, a comprehensive set of comprehensive test methods was established to accurately measure microwave Jc at different frequencies.

探索一种能够准确测量HTS薄膜微波Jc与频率依赖关系的方法，无论对HTS微波器件的研制，还是对HTS微波非线性机理的探究都具有重要的意义。在HTS微波滤波器和限幅器的设计过程中，需要依靠准确的微波Jc参数分别确定功率承载能力和限幅功率；在HTS微波非线性机理研究中，需要准确的数据为理论探索提供支撑。目前针对微波Jc与频率依赖关系的测量存在准确度不足的问题，以及由样品不一致引起的数据可靠性下降的问题。因此本研究拟基于微桥谐振器的不同谐振模式\频率，主要开展如下创新研究：(1) 建立微桥谐振器在各种谐振模式\频率下，微波Jc与可读取测试参数之间的解析式关系模型；(2) 构造一种能够实现外部耦合连续调谐的结构，提高能量的利用率，降低测试复杂度。将上述研究与已有的测试中间参数的方法相结合，在科学规划整个测试方案及流程的基础上，建立一套完善的通用测试方法对不同频率下的微波Jc进行准确测量。

本项目针对目前在HTS薄膜微波非线性机理尚不明确的情况下，不能从直流或低频交流Jc值准确推算微波频段下薄膜Jc值的问题，研究一种基于微桥谐振器获取微波Jc与频率的依赖关系的测量方式。本项目通过对不同谐振模式/频率下，微波Jc与可测参数之间关系模型的研究、能够实现外部耦合连续调谐结构的研究以及对测试平台的研究，在科学规划整体测试方案及流程的基础上，建立一套完善的通用测试方法对不同频率下的微波Jc进行准确测量，同时研究了超宽带功率分配器、宽阻带滤波器等高性能器件，有望在微波行业其他领域得以应用。通过对多种样品的测试分析，测试误差小于3%。在实验中确认了微波Jc会随着频率提高而上升的现象。.本项目整体上解决了传统测量方法所存在的测量准确度不足，以及由样品不一值引起的数据可靠性下降的问题。本研究无论对HTS微波器件的研制，还是对HTS微波非线性机理的探究都具有重要的意义。