3mm波段上105次高温超导谐波混频  

THE 105th HARMONIC MIXING AT 3MM WAVEBAND IN HIGH-T_c SUPERCONDUCTING JOSEPHSON JUNCTION

作　　者：王华兵[1] 许伟伟[1] 程其恒[1] 吴培亨[1] 骆永健[1] 叶华[1] 张进民[1] 

机构地区：[1]南京大学信息物理系,中山大学电子系

出　　处：《低温物理学报》1994年第3期208-212,共5页Low Temperature Physical Letters

基　　金：国家超导技术联合研究开发中心资助

摘　　要：本文利用高ＴｃＪｏｓｅｐｈｓｏｎ结在３ｍｍ波段上观察到了１０５次谐波混频，这是目前在此波段上谐波次数最高的报道．通过对Ｊｏｓｅｐｈｓｏｎ结和偏置电路之间连接方式的改进，使中频输出电平和信噪比都得到了提高．本文还初步研究了本征频率和谐波次数对中频输出的影响．实验表明，当本征频率低于１０Ｈｚ时，中频信号的输出幅度和信噪比很难达到一定的要求，此外，对高ＴｃＪｏｓｅｐｈｓｏｎ结谐波混频在微波锁相环路中应用的要求提出了初步看法．Abstract Using hish-Tc superconducting Josephson junction, the 105th harmonic mixing was observed between a signal at the frequency of 95 GHz and a local oscillator at that ot about 900 MHz. As far as the operating frequency and the harmonic number are concerned,this is the best result till now. Both the IF output level and the signal to noise ratio were improved by the proper connection between the Josephson junction and DC bias circuit. The influences of local oscillator frequency and harmonic number on the IF output are discussed in detail,indicahog that the LO frequency should not be much smaller than 1GHz. Also discussed are the possible applications of high-Tc Josephson junction harmonic mixings to phase-locking,frequency-stabilizing and so on.

关 键 词：约瑟夫森结 混频器 谐波 超导体 

分 类 号：TN773[电子电信—电路与系统]