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Ultra-low loss lumped element cryogenic coolable high pass filter and cryogenic measurement method
Liu, Hongfei1,2; Weinreb, Sander3
2017-09-01
Source PublicationMICROWAVE AND OPTICAL TECHNOLOGY LETTERS
ISSN0895-2477
Volume59Issue:9Pages:2229-2235
Corresponding AuthorLiu, Hongfei(lhf@bao.ac.cn)
AbstractThis 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.
Keywordhigh pass filter ultra-low loss cryogenic cooling cryogenic measurement
DOI10.1002/mop.30718
Indexed BySCI
Language英语
WOS Research AreaEngineering ; Optics
WOS SubjectEngineering, Electrical & Electronic ; Optics
WOS IDWOS:000404366000024
PublisherWILEY
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/22917
Collection中国科学院紫金山天文台
Corresponding AuthorLiu, Hongfei
Affiliation1.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
Recommended Citation
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.
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