Advanced technologies for heterodyne radio astronomy instrumentation - Part1 by A. Pavolotsky, and Advanced technologies for heterodyne radio astronomy instrumentation - Part2 by V. Desmaris

We present the advanced micro/nano technological engineering at the atomic level producing state-of-the-art epitaxial NbN thin-films on GaN buffer layers. Furthermore, we report the outstanding performance of the hot electron bolometers fabricated on epitaxial NbN thin films on GaN buffer layers. Finally we present advanced passive devices such as waveguide hybrids, IF hybrids and combiners for the realization of heterodyne THz receivers.