頁籤選單縮合
題名 | Influences of Feed Structure on the Performance of Cross-Coupled Narrow-Band YBCO Filters |
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作者 | Wang, L. M.; Hsieh, Chang-hao; Chen, Chih-chang; Wu, Jie-fan; | 書刊名 | Chinese Journal of Physics |
卷期 | 43:3(2) 民94.06 |
頁次 | 頁702-708 |
分類號 | 337.472 |
關鍵詞 | |
語文 | 英文(English) |
英文摘要 | Narrow-band microstrip cross-coupled band-pass filters based on the quadruplet geometry are designed for wireless-communication applications. The high-Tc superconducting filters were fabricated by patterning YBa₂Cu₃Oy (YBCO) films double-sided deposited on 20-mm-square and 0.5-mm-thick LaAlO₃ substrates. Each of the half-wavelength resonators in the filter consists of loop-like inductor and two patch capacitors at both ends. The inductive coupling between the non-adjacent resonators produces transmission zeros in the frequency response. Due to the presence of transmission zeros near the pass-band edge, a steep skirt characteristic is exhibited in the frequency response. It is found that the filter performances are strongly affected by the feed geometries designed. We obtain an optimum feed structure for our 4-pole 20-mm-square filters, showing a 1.936-GHz center frequency with a 16-MHz bandwidth and a 2.2-dB maximum insertion loss at 77 K. The influences of feed structure on the filter performance are systematically investigated. |
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