Title :
A 65 – 100 GHz impedance transforming hybrid coupler for a V- /W-band AlGaN/GaN MMIC
Author :
Pahl, Philipp ; Diebold, Sebastian ; Schwantuschke, Dirk ; Wagner, Steffen ; Lozar, R. ; Quay, Ruediger ; Kallfass, I. ; Zwick, T.
Author_Institution :
Inst. fur Hochfrequenztech. und Elektron. (IHE), Karlsruhe Inst. of Technol. (KIT), Karlsruhe, Germany
Abstract :
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 Ω to 18 Ω 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.
Keywords :
III-V semiconductors; MMIC amplifiers; aluminium compounds; gallium compounds; power amplifiers; wide band gap semiconductors; AlGaN-GaN; LDBC; V-/W-band AlGaN/GaN MMIC; bandwidth 65 GHz to 100 GHz; frequency 80 GHz; hybrid coupler; lumped-distributed branchline coupler; millimeter-wave frequencies; power amplifier; resistance 50 ohm to 18 ohm; Couplers; Gain; HEMTs; Impedance; Insertion loss; Loss measurement; Semiconductor device measurement;
Conference_Titel :
Microwave Integrated Circuits Conference (EuMIC), 2013 European
Conference_Location :
Nuremberg
