大功率高温超导滤波器的设计与功率测试  

DESIGN AND MEASUREMENT ON POWER HANDING CAPABILITY FOR HIGH TEMPERATURE SUPERCONDUCTIVE FILTER

作　　者：田佳[1] 郭旭波[1] 张晓平[1] 彭慧丽[1] 慕利娟[2] 郜龙马[1] 魏斌[1] 曹必松[1] 

机构地区：[1]清华大学物理系,北京100084 [2]内蒙古科技大学理学院,包头014010

出　　处：《低温物理学报》2007年第2期105-108,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金(项目编号:60471001)资助的课题~~

摘　　要：本文在双面YBCO高温超导薄膜上设计并制备了两节大功率超导滤波器,根据滤波器功率承载能力与最大电流密度之间的关系,减小电流密度和分散电流密度的分布是提高功率承载能力的关键.本文采用增加超导谐振器尺寸、优化几何结构及改进馈线耦合方式的方法,设计了两节2GHz频段梭型谐振器结构的滤波器.设计及测量结果显示了馈线结构及谐振器几何尺寸优化程度对超导滤波器功率承载能力有不同程度的影响,说明了在大功率超导滤波器设计中应选用无结点间隙耦合式馈线以抑制电流密度的聚集.采用优化后的谐振器结构制备的梭型两节超导滤波器经测试功率承载能力为2W.超导滤波器的尺寸为25×12mmLaAlO3基片,中心频率2.022GHz,相对带宽为2.4%.同时给出了超导滤波器功率测试的结构和方法.Power handling capability on two pole high power high temperature superconductor （HTS） filters was studied in this paper. According to the relationship between power handling capability and current density, reducing the current density or scattering the distribution of the current density is the way to enhance the power handling capability. The methods we used including enhance the area of resonator, optimize geometry structure and improving the feedback line to the face coupling. The two pole chipshape HTS filter and shuttle-shape microstrip HTS filter were fabricated. The measurement results showed the power handling capability was strongly depending on the maximum current density. We found that the feedback line directly connect to the resonator lead to the current density focus on the cross junction point that will degenerated the power handling capability. Further more the geometry structure of resonator, face coupling feedback line were used in shuttle-shape HTS filer design. The power handling capability measurement for HTS shuttle-shape filter was over 34 dBm at 70 K with sufficiently low insertion loss. The filter has a center frequency of 2022 MHz with a 2.5% bandwidth, with area of 25 × 12 mm. The paper also presented the power measurement process and method.

关 键 词：高温超导滤波器 大功率 电流密度分布优化 

分 类 号：O482[理学—固体物理]