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K- band Focal Plane Array. K band History. Science workshop determined efficiency improvements necessary for K Band: weather, observing requests, mapping programs.

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Presentation Transcript
slide1

K- band

Focal Plane Array

k band history
K band History
  • Science workshop determined efficiency improvements necessary for K Band: weather, observing requests, mapping programs.
  • Only enough funds for the receiver only, so the project was de-scoped to seven pixels that meets science objectives as specified in the science case.
    • $1.2 M Total
    • $0.19 M Parts
    • $0.2 M Contingency
    • $0.83 M Labor
  • The K band seven pixel focal plane array is the path finder instrument: a necessary first step and feasible considering time frame.
    • Seven pixel array construction complete December, 2009
    • Production use by November, 2010.
k band focal plane array
K band Focal Plane Array
  • Science Driver → Map NH3
    • Polarized without Rotation
  • Seven Beams → Limited by IF system
  • 1.8 GHz BW → Limited by IF system
  • 800 MHz BW → Limited by Spectrometer
k band fpa deliverables
K-band FPA Deliverables
  • Frontend
    • Cryogenic Package for Seven Pixel Instrument
    • Seven Dual Circular Polarization K band Pixels
    • Modular Noise Calibration for each Pixel
    • Modular Downconverter for each Channel (14)
    • Monitor and Control Electronics
    • LO Distribution with Doubler for LO1A
  • Software
    • Package for Engineering M&C
    • Observing Software Manager
    • Data Analysis Pipeline
  • Cost per Pixel not including NRE.
    • $46,000 Parts (Dewar,EM parts, Isolator, HEMT Amp, WG parts, Noise Mod, IDM)
    • $2500 Labor Construction.
    • $2500 Software upgrades.
focal plane coverage

1. Initial 7 elements above 68%

beam efficiency (illumination

and spillover)

2. Expandable to as many as

61 elements

3. beam efficiency of outermost

elements would drop to ~60%.

4. beam spacing = 3 HPBWs

Focal Plane Coverage

simulated beam efficiency

vs. offset from center

slide7

Noise Temperature and Headroom Limited by

Existing Cryogenic LNA Design

Noise Temperature: 36 K max 18-26.5 GHz, 25 K over 75% of band

P1dB Headroom: 30 dB when Tant = 300 K

slide8

Cosine Taper Corrugated Feed Horn

Frequency Range: 18-26.5 GHz (17-27.5 GHz goal)

k band single pixel

Feed

Thermal Transition

Isolators

Phase Shifter

OMT

HEMT

Noise Module

Sliding

Transition

K Band Single Pixel
slide18

Two downconverters are needed to implement the IF multiplexing scheme.

The second downconverter simply omits the latter mixing stage.

future fpa developments wish list
Future FPA Developments Wish List
  • Significantly enhanced spectrometer with this new array and existing IF system.
  • New digital I.F. distribution system. (Spectrometer and technology dependent).
  • Expanded focal plane array (perhaps at a different frequency: W band)