Small-signal modeling approach to 0.1-μm metamorphic HEMTs for W-band coplanar MMIC amplifier design

► A reliable small-signal modeling for the W-band MHEMTs. ► 17 distributed ECPs determined through a gradient optimization algorithm in a W-band frequency range. ► Excellent agreement between the measurements and simulation data revealed from the fabricated W-band MMIC amplifiers.