研究目的
Designing the first reported full W-band (75–110 GHz) power amplifier (PA) monolithic microwave integrated circuits (MMICs) based on gallium nitride technology to achieve high power levels over the complete W-band.
研究成果
The paper presents the design and implementation of two PA MMICs that cover the whole W-band with high power, utilizing low-impedance MSLs for reactive matching and a novel type of radial stubs in the dc-bias paths. These measures resulted in PAs that can deliver on average 25.6 dBm (three-stage) and 27 dBm (four-stage) over a 70–110-GHz band, with a peak output power of 28.6 dBm at 80 GHz. The technology enables high RF-power density up to 2.6 W/mm, making wideband 1-W+ MMICs feasible for future applications.
研究不足
The study acknowledges the challenges of using wide microstrip lines (MSLs) due to potential propagation of higher order modes within the band of interest, which limits the minimum realizable impedance level to 17 Ω.