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We report 50-nm T-gate metamorphic high-electron mobility transistors (MHEMTs) with low noise figure and high characteristics. The 30 mumtimes2 MHEMT shows a drain current density of 690 mA/mm, a gm,max of 1270 mS/mm, an fT of 489 GHz, and an of 422 GHz. In the frequency range of 59-61 GHz, the noise figure is less than 0.7 dB, and the associated gain was greater than 9 dB at a drain voltage of 1...
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