QuinStar presented the whitepaper High-Efficiency, Ka-band GaN Power Amplifiers at the International Microwave Symposium 2019.
Ka-Band GaN Power Amplifiers Abstract
In summary, this paper reports the design and performance of state-of-the-art GaN MMICs and a fully packaged Ka-band SSPA. Using harmonic tuning, the MMICs produce power levels up to 10 W CW with efficiencies in the high thirties (42% peak) at frequencies of 30 to 34 GHz. These results represent the highest combination of CW power and efficiency at these frequencies. The SSPA uses a 4-way combiner operating over 31 to 34 GHz. Biased at 24 V, this SSPA produced an output power of greater than 20 W CW with an associated PAE of greater than 30% across the band. Biased for maximum power at 28 V, it achieved an output power of 32 W CW at 32.5 GHz. The associated PAE was 30%.
Significantly, this is the highest reported efficiency at this frequency for a packaged amplifier with greater than 30 W CW output power.
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