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A 65 - 100 GHz impedance transforming hybrid coupler for a V- /W-band AlGaN/GaN MMIC

: Pahl, P.; Diebold, S.; Schwantuschke, D.; Wagner, S.; Lozar, R.; Quay, R.; Kallfass, I.; Zwick, T.

European Microwave Association:
8th European Microwave Integrated Circuits Conference, EuMIC 2013. Proceedings : 6-8 Oct 2013, Nuremberg, Germany; Part of European Microwave Week
Piscataway, NJ: IEEE, 2013
ISBN: 978-2-87487-032-3
ISBN: 978-1-4799-0266-8
European Microwave Integrated Circuits Conference (EuMIC) <8, 2013, Nuremberg>
European Microwave Week (EuMW) <16, 2013, Nuremberg>
Conference Paper
Fraunhofer IAF ()

This paper demonstrates the feasibility of impedance transforming lumped-distributed branchline couplers (LDBC) at millimeter-wave frequencies. Simulation and measurement results of a W-band 50 to 18 transforming coupler are compared and show a good agreement. The LDBC has a relative bandwidth of 42% (65 GHz-100 GHz) and an insertion loss of about 1 dB at 80 GHz. A balanced power amplifier is presented employing the designed hybrid coupler to demonstrate the overall performance.