Study of 2.0 GHz Miniaturized HTS Microwave Filters

• Main Authors: Ming-Han Tsai, 蔡明翰
• Other Authors: Hui-Kai Zeng
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/39377051044621051262

碩士 === 中原大學 === 電子工程研究所 === 97 === In this thesis, a 2.0 GHz miniaturized microwave coupling filter is proposed. It fabricated on the 1 cm2 LAO substrate by using YBCO high-temperature superconductor (HTS) thin films. The contents focus on the frequency response from its corresponding structure, and the results will be compared with each other which include simulation and measurement results. The filter is composed by two types of half-wave resonators: one is U-type stepped impedance resonators (SIR), and the other is compact stepped impedance resonators. Moreover, there are two feeding lines placed on both sides of the filter. The measurement results show that central frequency is 2.07 GHz, fractional bandwidth (FBW) is 9.0%, return loss is better than 26 dB, insertion loss is 0.002 dB, the edge rejection slope of the passband is 2.10 dB/MHz and 2.08 dB/GHz respectively, and the overall area of the filter not including the feeding lines is only 58.08 mm2. The filter has not only better performance in passband but also more miniature size than the formerly classic four-order cross-coupled filters.