2-GHz Band Cryogenic Receiver Front End for Mobile Communication Base Station Systems

Toshio NOJIMA  Shoichi NARAHASHI  Tetsuya MIMURA  Kei SATOH  Yasunori SUZUKI  

IEICE TRANSACTIONS on Communications   Vol.E83-B    No.8    pp.1834-1843
Publication Date: 2000/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
radio base station equipment,  cryogenic receiver front end,  superconducting filter,  low noise amplifier,  mobile communication,  

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An ultra low-noise and highly selective, experimental 2-GHz band cryogenic receiver front end (CRFE) has been newly developed for cellular base stations. It utilizes a high-Q superconducting filter, a very low noise cryogenic amplifier, and a highly reliable cooler that is very compact. Fundamental design of the CRFE is investigated. First, the equivalent noise temperature of the CRFE and the effect of improving CRFE sensitivity on base station reception are discussed. Next, essential technologies and fundamental characteristics of each component are described. Finally, influence of antenna noise, such as ground noise and man-made noise, is estimated through field tests both in urban and suburban areas.