8-GHz Narrowband High-Temperature Superconducting Filter With High Selectivity and Flat Group Delay

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	8-GHz Narrowband High-Temperature Superconducting Filter With High Selectivity and Flat Group Delay
	Gao, L ; Sun, L ; Li, F ; Zhang, Q ; Wang, YH ; Yu, T ; Guo, J ; Bian, YB ; Li, CG ; Zhang, XQ ; Li, H ; Meng, JB ; He, YS
刊名	IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
	2009
卷号	57 期号:7 页码:1767
关键词	WIRELESS COMMUNICATIONS HTS FILTER SUBSTRATE
ISSN号	0018-9480
通讯作者	Gao, L: Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	This paper reports a development of a narrowband high-temperature superconducting filter with both high selectivity and flat group delay. The filter has a center frequency of 8.625 GHz and a 3-dB bandwidth of 42 MHz (a fractional bandwidth of 0.49 %). In order to achieve both high band-edge steepness and excellent group-delay flatness, we introduce a 14-resonator quasi-elliptic function response with three pairs of transmission zeros (one pair for high selectivity and two pairs for flat group delay) in the cascaded quadruplet coupling structure. We also develop a novel low radiation resonator (double-folded resonator) to reduce the parasitic coupling and meet other requirements for the 8-GHz filter. The filter was fabricated on a 2-in-diameter 0.5-mm-thick MgO wafer with double-sided YBCO films. The measured results show a midband insertion loss of 1.6 dB and a return loss better than 15.5 dB. Band-edge steepness reaches over 11.7 dB/MHz; at both the high- and low-frequency edges. The 60-dB rectangle ratio is less than 1.25. The out-of-band rejection is over 70 dB at 5.98 MHz from the 3-dB band edge. The variation of group delay is less than 23 ns over 33 MHz (78.5% of 3-dB bandwidth), and less than 30 ns over 34.5 MHz (82% of 3-dB bandwidth).
收录类别	SCI
资助信息	Chinese Academy of Sciences [KJCX2-YW-WI6]; Ministry of Science and Technology of China [2007AA03Z215]
语种	英语
公开日期	2013-09-17
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/32808]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Gao, L,Sun, L,Li, F,et al. 8-GHz Narrowband High-Temperature Superconducting Filter With High Selectivity and Flat Group Delay[J]. IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES,2009,57(7):1767.
APA	Gao, L.,Sun, L.,Li, F.,Zhang, Q.,Wang, YH.,...&He, YS.(2009).8-GHz Narrowband High-Temperature Superconducting Filter With High Selectivity and Flat Group Delay.IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES,57(7),1767.
MLA	Gao, L,et al."8-GHz Narrowband High-Temperature Superconducting Filter With High Selectivity and Flat Group Delay".IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES 57.7(2009):1767.