MILLIMETER WAVE
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Last Modified: Wednesday, 10-July-01 10:05 AM EDT




This material is based on work supported by the National Science Foundation under Grants AST-9532046 and AST-9725951.

Any opinions, findings and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect those of the National Science Foundation.

System Description

  • SEQUOIA is a cryogenic focal plane array designed for the 85-115.6 GHz range.
  • 32 pixels are arranged in a dual-polarized 4x4 array.
  • The system uses InP MMIC (Monolithic Microwave Integrated Circuit) preamplifiers with 35-40dB gain.
  • The noise temperature ranges from 50-80K over most of the band.
  • No mechanical or electrical tuning is used.
  • In each pixel, the preamplifier is followed by a subharmonic mixer with an IF band from 5-20GHz.
  • The entire signal band is covered with single sideband response using just two LO's, at 40GHz and 60GHz.


Photograph of one of the assembled 16-pixel array.




Inside the SEQUOIA dewar.
(See block diagram below for details of the single pixel assembly.)

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