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1.前言自1986年发现了在液氮温区的高Tc超导材料以来,已经历了三代超导材料:第一代是镧系;第二代是钇系;第三代是铋系,铊系等。由于新的超导材料问世,使许多国家将超导在微波电子学领域、空间技术等方面开展了引人注目的研究工作,成为超导走向实际应用的突破点。美国NRL实验室在研究计划中把高Tc超导微波电路应用在卫星通信系统上,以图在将超导技术应用在空间实验中取得领先地位;国内在
1. Introduction Since it was discovered in 1986 that high Tc superconducting materials in the liquid nitrogen temperature region have gone through three generations of superconducting materials: the first generation is lanthanum; the second generation is yttrium; the third generation is bismuth, Thallium and so on. Due to the advent of new superconducting materials, many countries have made remarkable research on superconductivity in the fields of microwave electronics and space technology, and become the breakthrough points for the practical application of superconductivity. US NRL laboratory in the research program to high Tc superconducting microwave circuits used in satellite communications systems to map in the application of superconducting technology in space to obtain a leading position in the experiment;