Design of sextuple-mode triple-ring HTS UWB filter using two-round interpolation

A single-stage ring resonator capable of introducing six modes within the ultra-wideband (UWB) passband is presented. The sextuple-mode resonator consists of three rings and three sets of stepped-impedance open stubs. Based on this sextuple-mode resonator, a UWB filter fed by the interdigital-coupling line (ICL) is designed. And we propose a two-round interpolation method to obtain the filter's initial dimensions. The designed filter is fabricated on a double-sided YBCO/MgO/YBCO high-temperature superconducting (HTS) thin film for demonstration. The experimental results show that this UWB filter produces eight resonances in the passband eventually, which effectively improves the in-band reflection and the band-edge steepness. Moreover, the upper stopband performance is enhanced due to the transmission zeros (TZs) generated by the stepped-impedance open stubs and the ICL structure. The measured good performance verifies the practicability of the two-round interpolation approach, which can also be extended to other odd-even-mode filter designs.     

高温超导窄带广义切比雪夫函数滤波器

提出了一种用于高温超导滤波器制作的新结构窄带广义切比雪夫函数高、低通滤波器级联方式.该方式利用高温超导低插损特性,可以有效地降低极陡峭广义切比雪夫函数低通、高通滤波器的带边频滚降.依靠高、低通滤波器级联方式构建新形式的窄带极陡峭低插损高温超导滤波器,并与已有高温超导滤波器进行了比较分析.     

高温超导薄膜在微波双工器上的应用

本文采用全波电磁仿真方法设计、制作并测试了一种工作于C波段的星载高温超导微波双工器,采用的材料是在厚度为0.5mm介电常数为23.5的LaAlO3衬底上用磁控溅射法制备而成的双面氧化物高温超导薄膜YBCO.利用在微波范围内,高温超导薄膜的Q值比常规导体高1～3个数量级的特点,实现了器件的小型化和低插损.     

并行多分裂迭代收敛速率的估计

本文给出了并多分裂迭代（PMI）收敛速度的一个估计式,利用此估计式可以简化和统一PMI方法的收敛性证明。     

利用H3PO4液层侧面红外热像研究YBCO高温超导薄膜的激光辅助刻蚀特性

利用红外热像实时监测系统,获取钇钡铜氧激光辅助化学刻蚀中H₃PO₄液层的侧面红外热像,研究了其溶液温度分布与热对流特性,并对红外监测数据与钇钡铜氧薄膜激光化学刻蚀特性的关系进行了分析.主要实验结论包括:红外灰度图可真实反映溶液的温度分布和热对流情况,为激光化学刻蚀的热环境分析提供有价值的红外监测数据;通过任意时刻钇钡铜氧表面生成热流所到达高度的分布情况和该时刻的红外灰度图,分析出钇钡铜氧薄膜表面各区域的腐蚀启动先后和刻蚀程度差异等重要信息,为钇钡铜氧及其它材料的激光化学刻蚀特性的实时监测提供了一种新的技术手段.     

Switchable and tunable triple-channel bandpass filter

A triple-channel bandpass filter with switchable and tunable functions is proposed, which is based on a triple-mode cross resonator. The varactors and switching diodes are loaded at the end of the resonator. Because of the use of switches, resonators have four working states: conventional single-mode, two dual-modes, and one triple-mode. The varactor makes the channel independently adjustable. Finally, a triple-channel bandpass filter with switchable and tunable functions is designed by using two identical triple-mode resonator coupling structures. To solve the problem of whether each channel in the multi-channel filter is independently adjustable, this paper gives a simple and rigorous judgment method, namely rank criterion, which is a necessary and sufficient condition for each channel to be independently adjustable. The method of designing an element variable coupling matrix (EVCM) is adopted, which can not only obtain the desired frequency response through adjustable elements but also help to select resonators and coupling modes in the actual circuit design. The final circuit size of the designed filter is 0.29 λg×0.26 λg. The measured results are in good agreement with the simulation results.     

高温超导窄带广义切比雪夫函数滤波器

提出了一种用于高温超导滤波器制作的新结构——窄带广义切比雪夫函数高、低通滤波器级联方式．该方式利用高温超导低插损特性，可以有效地降低极陡峭广义切比雪夫函数低通、高通滤波器的带边频滚降．依靠高、低通滤波器级联方式构建新形式的窄带极陡峭低插损高温超导滤波器．并与已有高温超导滤波器进行了比较分析．     

高温超导级联滤波器

本文研究高温超导滤波器的级联问题,对高温超导级联滤波器的研究进行了理论和实践上的尝试,得出了一种可能的解决复杂高温超导多级滤波器设计的方法,并据此试制了一个12级高温超导级联滤波器.     

高温超导微波谐振器非线性测试及应用研究

本文对高温超导微波谐振器的非线性特性做了测试，对测试结果进行了分析t并对该谐振器的构造方案做了分析．发展并实现了利用中等功率电平进行微波临界电流附近高温超导强非线性特性的测试方案．     

高温超导微波谐振器非线性测试及应用研究

本文对高温超导微波谐振器的非线性特性做了测试,对测试结果进行了分析,并对该谐振器的构造方案做了分析,发展并实现了利用中等功率电平进行微波临界电流附近高温超导强非线性特性的测试方案.