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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:
43rd European Microwave Conference, EuMC 2013. Proceedings : 6.-11. Oktober, 2013, Nürnberg, European Microwave Week, EuMW
Louvain-la-Neuve: European Microwave Assiciation, 2013
ISBN: 978-2-87487-031-6
European Microwave Conference (EuMC) <43, 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 (omega) to 18 (omega) 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.