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Investigation of high-efficiency hybrid power combining for ka-band frequencies

: Neininger, Philipp; Meder, Dirk; John, Laurenz; Friesicke, Christian; Quay, Rüdiger; Zwick, Thomas


Institute of Electrical and Electronics Engineers -IEEE-; Institute of Electronics, Information and Communication Engineers -IEICE-, Tokyo:
Asia-Pacific Microwave Conference, APMC 2018. Proceedings : 6-9 November 2018, Kyoto, Japan
Piscataway, NJ: IEEE, 2018
ISBN: 978-4-9023-3945-1
ISBN: 978-1-5386-2184-4
Asia-Pacific Microwave Conference (APMC) <2018, Kyoto>
Fraunhofer IAF ()

In this paper, planar hybrid assembly is investigated as a cost-effective alternative to waveguide and radial power combining of high-power GaN MMICs. To that end, a low loss three-section branch-line coupler is developed and used as a power divider/combiner. It achieves an insertion loss of less than 0.3 dB between 25 and 35 GHz, which is a relative bandwidth of more than 30 %. Together with two Ka-band power amplifier MMICs, it is assembled onto a baseplate. Small-signal characterization show very little deterioration in gain. Thus, the achievable output power nearly doubles over the whole frequency range.