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6.4 Large-Signal Measurements

To evaluate the high-power performance of transistors with a gate width of $ {\it W}_{\mathrm{g}}$$ \geq$ 500 $ \mu $m a load-pull measurement system was set up for the Ka-band frequency band (26.5-40 GHz) [298]. The description of the load-pull system can be found in Appendix A. Using this system a systematic study is performed to evaluate and compare different HEMT designs with respect to high power performance between 30 GHz and 40 GHz.