Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819680 | Physica C: Superconductivity and its Applications | 2009 | 5 Pages |
Abstract
An ultra-narrow band eight-pole dual-mode HTS patch filter was designed and fabricated. The filter is constructed by four corner-cut square patches, each of which has two resonating modes. The influence of the change of the corner-cut position on the filter response was investigated by simulations. Four small rectangle patches were added in the topology of the filter as tuning tools. By employing this unique tuning structure, the simulated filter responses and current density distributions on the patches have been greatly improved. The filter was fabricated using double sided YBCO films on a 3Â in. LaAlO3 substrate. The measured results showed satisfactory performance with center frequency 2.494Â GHz, fractional bandwidth 0.2%, return loss in passband better than 16Â dB, and out-of-band rejection of the filter better than 90Â dB at 15Â MHz away from its center frequency.
Related Topics
Physical Sciences and Engineering
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Condensed Matter Physics
Authors
Xiaofeng He, Xueqiang Zhang, Yuehui Wang, Lu Gao, Jia Wang, Bin Cui, Yongbo Bian, Tao Yu, Qiang Zhang, Hong Li, Chunguang Li, Junjie Li, Changzhi Gu, Yusheng He,