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<para> Copper-metallized AlGaAs/InGaAs pseudomophic high-electron mobility transistor single-pole–double-throw (SPDT) switches utilizing platinum (Pt, 70 nm) as the diffusion barrier have been studied and demonstrated. As compared with the Au-metallized switches, the Cu-metallized SPDT switches exhibited comparable performance with insertion loss less than 0.5 dB, return loss larger than 20...
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