A Switchable, Passively Tuneable 28 GHz to 39 GHz Upconversion Link for a 5G Repeater using a Broadside Coupler and Analog Predistortion in a 130 nm BiCMOS Technology. - Julian Potschka; Julian Zuber; Katharina Kolb; Tim Maiwald; Marco Dietz; Amelie Hagelauer; Klaus Aufinger; Robert Weigel (NEWCAS, 2020)