Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method

	Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method
	Liu, Hongfei 1,2; Weinreb, Sander 3
刊名	MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
	2017-09-01
卷号	59 期号:9 页码:2229-2235
关键词	high pass filter ultra-low loss cryogenic cooling cryogenic measurement
英文摘要	This letter presents an ultra-low loss cryogenically-coolable lumped element high pass filter and the measurement method of its S parameters and noise temperature at cryogenic temperature. This filter is going to be used in RFI mitigation of FAST wideband single pixel receiver. It adopts 5 poles Chebyshev high pass structure, and ultra-low loss lumped elements are employed. At cryogenic temperature, its 3 dB cutoff frequency is 248 MHz and the high-end of passband with ultra-low insertion loss is up to 3.5 GHz. Specially, the novel mechanical and microwave design ensure effectively cryogenic cooling to all components of the filter. This filter can be operated at temperatures of 300-4 K. S parameters are measured at room and cryogenic temperatures. At 26 K, its insertion loss in passband is smaller than 0.1 dB. A direct measurement to noise temperature at 24 K physical temperature is performed in cryogenic Testing Dewar, and noise temperature smaller than 0.55 K is achieved. The stopband rejection at 95 MHz is larger than 43 dB. In passband, the return loss of 2 ports is larger than 23 dB.
WOS标题词	Science & Technology ; Technology ; Physical Sciences
类目[WOS]	Engineering, Electrical & Electronic ; Optics
研究领域[WOS]	Engineering ; Optics
收录类别	SCI
语种	英语
WOS记录号	WOS:000404366000024
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/8819]
专题	国家天文台_射电天文研究部
作者单位	1.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China 2.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 21008, Jiangsu, Peoples R China 3.CALTECH, Pasadena, CA 91125 USA
推荐引用方式 GB/T 7714	Liu, Hongfei,Weinreb, Sander. Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method[J]. MICROWAVE AND OPTICAL TECHNOLOGY LETTERS,2017,59(9):2229-2235.
APA	Liu, Hongfei,&Weinreb, Sander.(2017).Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method.MICROWAVE AND OPTICAL TECHNOLOGY LETTERS,59(9),2229-2235.
MLA	Liu, Hongfei,et al."Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method".MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 59.9(2017):2229-2235.