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We have built a 2SB mixer, which has demonstrated a sideband rejection ratio as high as 15 dB over the full band of 600–720 GHz and the SSB noise temperature between 200 and 370 K. Both sideband ration and noise temperature are well within the ALMA specifications.
The operating frequency of InP high electron mobility transistor (HEMT) based amplifiers has moved well in the submillimeter-wave frequencies over the last couple of years. Working amplifiers with usable gain in waveguide packages has been reported beyond 700 GHz. When cooled cryogenically, they have shown substantial improvement in their noise temperature. This has opened up the real possibility...
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