Fabrication and Characterization of Electrically Tunable Superconducting Filters

• Main Authors: Jie-Fan Wu, 吳介帆
• Other Authors: 宋皇輝,許崇宜
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/56557013432007345175

碩士 === 大葉大學 === 電信工程學系碩士班 === 93 === Abstract We have fabricated 2 GHz 4-pole cross-coupled superconducting microstrip filters with dielectric flip-chips. The dielectric flip-chip is a SrTiO3 thin film deposited on a p-type Si substrate. In order to tune center frequency of the filter, a voltage bias is applied through the interdigital Au electrodes on the SrTiO3 film to change the dielectric constant of the film. The center frequency can be modulated 4.1 MHz (0.2%) by applying electric field 0.7 V/cm at 77 K. Applying the electric filed locally to change dielectric constant above different part of the filter separately, we study the tuning effects to the electric coupling part, magnetic coupling part and mixed coupling part of the filter.