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Feed/Receiver Developments

Feed/Receiver Developments. ATA-TAP December 17, 2002 WJW. Prototype Wideband Feeds. 0.5 – 11 GHz. Second Model H-Plane. Second Model E-Plane. Cross-Polarization Both Models. Gain Tables. Feed Tests. Excellent (16 dB) match Agrees with EM calcs on Impedance Gain Internal Loss.

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Feed/Receiver Developments

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  1. Feed/Receiver Developments ATA-TAP December 17, 2002 WJW

  2. Prototype Wideband Feeds 0.5 – 11 GHz

  3. Second Model H-Plane

  4. Second Model E-Plane

  5. Cross-Polarization Both Models

  6. Gain Tables

  7. Feed Tests • Excellent (16 dB) match • Agrees with EM calcs on • Impedance • Gain • Internal Loss

  8. Measured LNA Temperature Measured and simulatednoise for WBA13 at 300K, 77K and 4K MMIC InP PHEMT .18 m Design by S. Weinreb

  9. Tip Circuit Board

  10. Dewar Layout

  11. Input Match and Cross Talk

  12. Feed Properties • Spillover • Input impedance • <Zin>=206 Ohms • Smax=1.35

  13. Odd Mode Resonances: No Cover

  14. Odd Mode Resonances: w. Cover

  15. Resonances w. & w/o. Cover: Absorber Added

  16. Spillover vs. Zenith Angle Tsys Zenith Angle

  17. Noise Summary for 10 GHz

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