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A novel type of broadband radial stub

: Ćwikliński, Maciej; Friesicke, Christian; Raay, Friedbert van; Massler, Hermann; Quay, Rüdiger; Ambacher, Oliver

48th European Microwave Conference, EuMC 2018. Proceedings : 25-27 September 2018, Madrid, Spain
London: Horizon House, 2018
ISBN: 978-2-87487-051-4
European Microwave Conference (EuMC) <48, 2018, Madrid>
Fraunhofer IAF ()
bias tee; broadband; monolithic microwave integrated circuit (MMIC); radial stub; W-band (75-110 GHz)

We report on a new type of broadband radialstub. It consists of two inclined half-stubs, which are separated by a small gap at their vertices. This radial stub can provide-15 dB rejection over almost 29% fractional bandwidth, which isan 86% improvement over the conventional radial stub. Using this stub in a double-sided (butterfly) configuration results in a-15 dB rejection bandwidth of about 61%, higher by a factor of two than in the case of a conventional butterfly stub. This stubwas utilized in the DC-bias paths of a GaN power amplifier, which can provide more than 10 dB of gain between 60 and 110 GHz,resulting in the first-ever GaN power amplifier able to cover the whole W-band (75-110 GHz).