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

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Presentation transcript:

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) matchExcellent (16 dB) match Agrees with EM calcs on Impedance Gain Internal Loss

Feed Measurements

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

Tip Circuit Board

Dewar Layout

Input Match and Cross Talk

Feed Properties Input impedance – =206 Ohms –S max =1.35  Spillover 42 o 18% 90 o 8.5% 135 o 3% Spillover

Odd Mode Resonances: No Cover

Odd Mode Resonances: w. Cover

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

Spillover vs. Zenith Angle Zenith Angle T sys

Noise Summary for 10 GHz ItemTemperatureNotes Feed (3%) 9.0Const w freq Tip Circuit Bd 3.0Varies w freq Transition Line 2.6 (20mil)Varies w freq Cold Line 2.4Varies w f req Spillover 3.0Const w freq Tbb 2.7Const Atmosphere 4GHz LNA 12.0 Total 4GHz