Fundamental characteristics of miniaturized cryogenic receiver front end and its affection for mobile communication base stations

摘要

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, essential technologies and fundamental characteristics of each component are described. Next, influence of antenna noise, such as ground noise and man-made noise, is estimated through field tests both in urban and suburban areas. Finally, the effect of improving CRFE sensitivity on base station reception are discussed.