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Research and Development of High-Temperature Superconductor Millimeter-Wave Filters

高温超导毫米波滤波器的研究与开发

基本信息

批准号：
14550318
负责人：
KOBAYASHI Yoshio
金额：
$ 2.3万
依托单位：
Saitama University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2002
资助国家：
日本
起止时间：
2002 至 2003
项目状态：
已结题

项目摘要

Recent years have seen extensive studies on high-temperature superconductor (HTS) filters with small-size, low loss, and high frequency selectivity. There have been numerous reports and publications on HTS microstrip filters. On the other hand, as filters using coplanar waveguide (CPW) structures require only, one side superconductor film, lower fabrication cost is expected compared with filters using microstrip structures using two-sides superconductor films.This research project is aimed at developing design and measuring methods of superconductor filters at millimeter-wave frequencies.In 2002, three measuring methods, including the circular cavity method, the cut-off circular waveguide method, and the four modes in a sapphire rod resonator method, are developed for accurate measurement of the dielectric substrate (MgO) and the frequency dependence of surface resistance of superconductor film (YBa_2Cu_3O_7, i.e., YBCO) at millimeter-waves. The results show that at 30GHz and 70K, the … More loss tangent of the MgO substrate is smaller than 2x10^<-6,> while the surface resistance of YBCO film is about one fifth of that of the copper. Therefore, low loss resonators and filters can be built by using these materials even at millimeter-waves.Based on these measured results, an H-slot type resonator using CPW structure is proposed, and the simulated results show it owns very high Q-factors at millimeter-waves. Next, a low-loss HTS CPW 4-pole Chebyshev filter is designed using the H-slot type resonators.In order to realize a high performance filter with low insertion-loss in its passband and sharp attenuation in its stopband, a general circuit model of a filter having one cross coupling path is analyzed, and a new theory is developed for the design of a filter with poles of attenuation in its stopband. By using the derived formulas, the reactance element values in the cross coupling path are determined readily. The attenuation poles can thus be assigned at desired frequencies. Various design examples are provided, together with simulated results, which validate the proposed theory.The research results have been published with 5 papers in IEICE Transactions on Electronics, 4 technical reports of IEICE, 6 oral presentations at the national conferences of IEICE, 3 papers at international symposiums, and 5 papers at a number of technical workshops. Less

近年来，人们对小型、低损耗、高频率选择性的高温超导滤波器进行了广泛的研究。已有大量关于高温超导微带滤波器的报道和出版物。另一方面，由于共面波导结构的滤波器只需要一面超导薄膜，因此与双面超导薄膜微带结构的滤波器相比，其制造成本可望降低。本研究计划旨在发展毫米波超导滤波器的设计和测量方法。2002年，我们提出了三种测量方法，包括圆形腔法，采用截止圆波导法和蓝宝石棒谐振器法中的四种模式，对介质衬底（MgO）和超导薄膜（YBa_2Cu_3O_7，即，YBCO）在毫米波。结果表明，在30 GHz和70 K下， ...更多信息 MgO衬底的损耗角正切小于2 × 10 ~（-6），YBCO薄膜的表面电阻约为铜的1/5。在此基础上，提出了一种采用共面波导结构的H槽型谐振器，仿真结果表明该谐振器在毫米波下具有很高的Q值。其次，采用H槽谐振器设计了一种低损耗的高温超导共面波导四极点切比雪夫滤波器，为了实现通带插入损耗小、阻带衰减大的高性能滤波器，分析了具有一条交叉耦合路径的滤波器的一般电路模型，提出了一种设计阻带衰减极点滤波器的新理论。利用导出的公式，可以方便地确定交叉耦合路径中的电抗元件值。因此，可以在期望的频率处分配衰减极点。研究成果已在IEICE电子学报上发表5篇论文，4篇IEICE技术报告，6篇在IEICE全国会议上的口头报告，3篇在国际研讨会上的论文，5篇在一些技术研讨会上的论文。少