用于甚高频rf SQUID的电感耦合式谐振器  

INDUCTANCE MATCHING LC RESONATOR FOR RF SQUID

作　　者：张凡[1] 谢飞翔[1] 马平[1] 王守证[1] 戴远东[1] 王世光[1] 

机构地区：[1]北京大学物理系人工微结构及介观物理国家重点实验室

出　　处：《低温物理学报》1999年第1期39-44,共6页Low Temperature Physical Letters

基　　金：国家超导研究及发展中心资助项目

摘　　要：我们对电感耦合式的ＬＣ谐振器进行了研究，在１００ＭＨｚ到１．５ＧＨｚ的频段内测量了这种谐振器的有载品质因数ＱＬ，并在１３０ＭＨｚ的电路上使用电感耦合式谐振器进行了磁场测量．实验表明，与原来的电容分路式谐振器相比，电感耦合式谐振器能提高品质因数Ｑ２～３倍，可用于较宽的频段范围内（１００ＭＨｚ～１．５ＧＨｚ），具有参数易于控制的优点，实际测量得到的磁通噪声谱密度，与电容分路式的谐振器相比，下降了３０％．Abstract We have studied the inductance matching LC resonator, and measured its performances in a wide frequency band range (100MHz～1.5GHz). In our experiments, we find that its quality factor is higher than the conventional tank circuit. The loaded quality factors are among 50 to 100 in that band range and are 2～3 times higher than the conventional tank circuits. We find that its parameters are easy to adjust to meet the different circuits. We used this new resonator in an rf SQUID of a frequency of 130MHz, and achieved the flux noise density of, which is 30% lower in comparison with the conventional resonator.

关 键 词：电感耦合式 谐振器 超导 SQUID 甚高频 

分 类 号：O511.1[理学—低温物理]