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Wideband Single Pixel Feeds DVA-1 Project Lynn Baker

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Wideband Single Pixel Feeds DVA-1 Project Lynn Baker. TDP Broadband Feed Development Goals. Research and prototype feeds with bandwidths up to 10:1 with high performance when mounted in reflector antennas. Develop matching wide band LNA’s closely integrated with the corresponding feed.

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Wideband Single Pixel Feeds

DVA-1 Project

Lynn Baker

Lynn Baker DVA-1 Meeting at NSF

tdp broadband feed development goals
TDP Broadband Feed Development Goals
  • Research and prototype feeds with bandwidths up to 10:1 with high performance when mounted in reflector antennas.
  • Develop matching wide band LNA’s closely integrated with the corresponding feed.
  • Develop supporting cryogenic cooling methods and designs.
  • Other research groups pursuing similar goals.

Lynn Baker DVA-1 Meeting at NSF

baseline frequency coverage plan
Baseline Frequency Coverage Plan
  • Cover .3 to 1.5 GHz with an uncooled feed with cooled LNA1. Low freqency feed is to too large to cryocool2. Thermal transition on transmission line challenging
  • Cover 1.5 to 10 GHz. with a completely cooled feed / LNA1. All cryocooled practical at higher frequencies
  • PAF mounted at prime focus with interchange mechanism

Lynn Baker DVA-1 Meeting at NSF

cal tech feed lna update
Cal Tech Feed / LNA Update
  • Three “Lindgren” style feeds built & measured, feed patterns measured both open and in a dewar can, two installed on the GAVRT antenna.
  • Data posted to feed pattern data base.
  • Continued development of differential LNA’s matched to feed characteristics.
  • Improved versions are under construction, both in LNA interface and in radiation pattern.

Lynn Baker DVA-1 Meeting at NSF

ata log periodic feed
ATA Log-periodic Feed

Lynn Baker DVA-1 Meeting at NSF

ata log periodic feed1
ATA Log-periodic Feed

Lynn Baker DVA-1 Meeting at NSF

ata log periodic update
ATA Log Periodic Update
  • Original design modeled in CST and calculated patterns included in TDP feed pattern data base.
  • Two versions of an improved feed are almost finished. One will be tested at Cal Tech and one at ATA facilities.
  • The new ATA version will be housed in a glass dewar and cryocooled. It also has a redesigned feed to LNA connection.
  • The new Cal Tech version will be housed in a metal dewar and cryocooled. Also has improved feed to LNA connection.

Lynn Baker DVA-1 Meeting at NSF

the ultra wide band qsc feed 300 mhz to 3 ghz prototype
The Ultra Wide Band QSC Feed300 MHz to 3 GHz Prototype

Truncated Ground plane to 500 MHz for Initial testing: low frequency extension straightforward

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Lynn Baker DVA-1 Meeting at NSF

qsc feed update
QSC Feed Update
  • Original model measured at Satimo and pattern data posted to the data base.
  • Second version designed and model patterns calculated both with and without a simulated dewar can.
  • Pattern data posted to data base.
  • Design work under way on a higher gain version and for other frequency bands.

Lynn Baker DVA-1 Meeting at NSF

broadband feed trade off risk mitigation
Broadband Feed Trade Off & Risk Mitigation
  • DVA-1 will provide a test bed to evaluate wide band feeds.
  • One (or more) corrugated horns will be mounted and tested in DVA-1
  • Combined with pricing for receiver packages these results will inform tradeoffs between performance, frequency coverage and cost.
  • Input from calibration and processing will be critical in evaluating feed options.

Lynn Baker DVA-1 Meeting at NSF

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