lindgren quadridge feeds s. weinreb and w. imbriale ska antenna working group may 6, 2009
Post on 20-Dec-2015
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Peak Gain
On-axis Gain
Peak Cross-pol
On-axis cross-pol
Lindgren Quadridge Feed measured performance
(0,45,90,135 cuts - amplitude, phase, principle and cross polarizations)
Predicted GAVRT performance (with no geometry errors)
Return Loss
Strut Blockage
RMS Loss
Overall
Physical Optics
Comparisons of measured (Venus) versus calculated (with geometry errors)
Measured (blue dots)Calculated (red line)
Comparison of GAVRT design with a front fed parabola
Assumes no surface RMS loss
GAVRT
F/D = 0.6F/D = 0.5F/D = 0.4
Comparison of GAVRT design with a front fed parabola
Assumes no surface RMS loss
GAVRT
F/D = 1.0F/D = 0.9F/D = 0.8