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A phase shifter with integrated PA MMIC for Ka-Band frequencies

: Neininger, Philipp; Amirpour, Raul; John, Laurenz; Friesicke, Christian; Quay, Rüdiger; Zwick, Thomas

Verband Deutscher Elektrotechniker e.V. -VDE-, Berlin:
German Microwave Conference, GeMiC 2020 : March 09-11, 2020, Cottbus, Germany
Piscataway, NJ: IEEE, 2020
ISBN: 978-3-9820397-1-8
ISBN: 978-1-7281-4206-7
German Microwave Conference (GeMiC) <2020, Cottbus>
Fraunhofer IAF ()
power amplifiers; gallium nitride; phase shifters; MMIC; Ka-Band

In this paper, we investigate a Ka-band high power reflective-type phase shifter using gallium nitride (GaN) high-electron mobility varactors (HEMVARs). To that end, we use GaN varactors that are optimized for power-handling capability and integrate them with a Lange coupler to form a reflective-type phase shifter (RTPS). Analyzing the phase shifter unit cell, adecade of band width is achievable. The insertion loss ranges below 3 dB while the maximum phase offset generated is between 30° at Ku-band and 7° at the upper end of the Ka-band. By including a buffer amplifier, we compensate the losses of two cascaded RTPS unit cells and measure a median relative 3-dB bandwidth of 23.3 % and positive net gain between 26 GHz and36 GHz. In 1 dB gain compression, the MMIC delivers an output power of more than 33.9 dBm at 30 GHz. The maximum phase shift the designed MMIC can synthesize is 40° and 28° in the lower and upper range of the Ka-band, respectively. To the best knowledge of the authors, this is the first published Ka-bandphase shifter using GaN HEMVARs.