| Autor: |
Jia-Sheng Hong, D. Jedamzik, R.B. Greed, Michael J. Lancaster |
| Rok vydání: |
1999 |
| Předmět: |
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| Zdroj: |
IEEE Transactions on Microwave Theory and Techniques. 47:1656-1663 |
| ISSN: |
0018-9480 |
| DOI: |
10.1109/22.788606 |
| Popis: |
This paper presents recent developments of an eight-pole planar high-temperature superconducting (HTS) bandpass filter with a quasi-elliptic function response. A novel planar filter configuration that allows a pair of transmission zeros to be placed at the band edges is described. The miniature HTS filter has a fraction bandwidth less than 1% and is designed for mobile communication base-station applications to increase sensitivity and selectivity. Design considerations including filter characteristics, design approach, sensitivity analysis and unloaded quality factor of resonators are addressed. The filter was fabricated using double-sided YBCO thin film on an MgO substrate of size 0.3/spl times/22.5/spl times/39 mm. Very good experimental results were obtained with the filter cooled using liquid nitrogen. The minimum passband loss was measured to be approximately 1 dB. The passband width at points 1 dB down from the minimum loss point was 12.8 MHz for a center frequency of 1738.5 MHz. High selectivity was achieved with a 30-dB rejection bandwidth of 16 MHz. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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