Michael Hrobak studied hybrid integrated front end modules for high frequency measurement equipment and especially for synthetic automatic test systems. Recent developments of innovative, critical millimeter-wave components like frequency multipliers, directional couplers, filters, triple balanced mixers and power detectors are illustrated by the author separately and in combination. 

Dr. Michael Hrobak is with the Microwave Department of the Ferdinand-Braun-Institut (FBH), Berlin, Germany, where he is involved in the development and measurement of monolithic integrated circuits using indium phosphide (InP) double heterojunction bipolar transistors (DHBT). His research interests are in the field of planar realizations of linear and nonlinear broadband components, including directional couplers and filters, balanced mixers, frequency multipliers and power detectors.