Design of a Ka-band MMIC Filtering LNA with a Metamorphic HEMT Technology for a Space Application

This paper presents a new approach to design MMIC LNAs. The proposed method allows to filter the out-of-band LNA gain and ensures the best compromise between input and noise matching in the Ka band (27-31 GHz) example. Because of these very strong constraints a rigorous method has been planned for selecting the best transistor whatever the MMIC technology. Then, in order to relax front-end selective filter specifications, out-of-band gain is eliminated thanks to different matching filtering circuits designed with a new filters synthesis tool (GENESYN).