用于高温射频超导量子干涉器的介质谐振器的性质研究  

Characteristics of dielectric resonators for high-transition-temperature radio frequency superconducting quantum interference devices

作　　者：高吉[1] 杨涛[1] 马平[1] 戴远东[1] 

机构地区：[1]北京大学物理学院,人工微结构和介观物理国家重点实验室,北京100871

出　　处：《物理学报》2010年第7期5044-5048,共5页Acta Physica Sinica

基　　金：国家重点基础研究发展计划(批准号:2006CB601007);国家自然科学基金(批准号:10674006);国家高技术研究发展计划(批准号:2007AA03Z238);通信系统信息控制技术国家重点实验室基金(批准号:9140C1304010803)资助的课题~~

摘　　要：介质谐振器是目前高温射频超导量子干涉器较常采用的一种高品质因数微波谐振器.它是由10mm×10mm×1mm的SrTiO3(STO)标准衬底及覆盖在其上的YBa2Cu3O7-δ(YBCO)薄膜磁通聚焦器共同构成的.为探明磁通聚焦器构形对介质谐振器谐振频率的影响,本文采用Ansoft公司出品的HFSS高频结构仿真软件对磁通聚焦器构形不同的若干介质谐振器的谐振特性进行了仿真.结果表明:增大磁通聚焦器开缝宽度,或者减小磁通聚焦器中心磁通聚焦孔半径,都会造成介质谐振器谐振频率升高.为验证仿真结果的可信性,抽样制备了一些介质谐振器并实际测量了它们的谐振特性,实测结果与仿真结果基本一致.研究表明,改变磁通聚焦器构形是调节介质谐振器谐振频率的一种有效方法.At present,the high-transition-temperature radio frequency superconducting quantum interference device（High-Tc RF SQUID） is usually coupled to a dielectric resonator which is a standard 10 mm×10 mm×1 mm SrTiO3（STO） substrate with a YBa2Cu3O7-δ（YBCO） thin-film flux focuser deposited on it.The dielectric resonator for the High-Tc RF SQUID has a high quality factor and a resonant frequency in the microwave range.In order to find out the effect of the flux focuser＇s geometry on the dielectric resonator＇s resonant frequency,we used ANSOFT high frequency structure simulator（ANSOFT HFSS） to simulate the resonance characteristics of some dielectric resonators with different flux focuser geometries.Our simulation results show that when the width of the flux focuser＇s slit increases or the radius of the flux focuser＇s inner hole decreases,the dielectric resonator＇s resonant frequency increases.To estimate the reliability of our simulation results,we selectively prepared a few dielectric resonators and measured their resonance characteristics.The experimental results are virtually consistent with the simulation results.Our study shows that changing the flux focuser geometry is an effective way to adjust the dielectric resonator＇s resonant frequency.

关 键 词：介质谐振器 高温射频超导量子干涉器 HFSS软件 

分 类 号：TN752[电子电信—电路与系统]