Demostrador del módulo posterior del radiómetro de 30 GHZ de Planck

Abstract

A radiometer back end module based on broadband low noise amplifiers and band pass filters is presented. Low noise amplifiers are multistage HEMT MMIC chips. A 20% of bandwidth at 30 GHz have been achieved. The passband is fixed by coupled lines microstrip filters. A complete module containing two identical branches of amplification and filtering stages with a gain greater than 30 dB has been developed. The low 1/f noise behavior of gain fluctuations allows the module to be used as the back end module for the differential radiometers in the european scientific mission Planck. Details of the MMICs chips and filters assembly as well as experimental results are included.