Update on Optics Design for SKA Reflector Antennas with Wide Band Single Pixel Feeds
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1 Update on Optics Design for SKA Reflector Antennas with Wide Band Single Pixel Feeds William Imbriale (2), Germán Cortés (1), and Lynn Baker (1) (1) NAIC, Cornell University, Ithaca, NY, 14853, USA (2) The Jet Propulsion Laboratory, Caltech, Pasadena, CA, USA National Astronomy and Ionosphere Center Cornell University Ithaca NY 14853, USA PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30,
2 Overview Introduction: The DVA_1 Antenna WBSP Feeds considered 12m Shaped Design Performance with WBSPF Variable Optics Octave Band Horn New Feed Work Summary
3 The DVA-1 Antenna (Dual Shaped Offset Optics) Baseline design 15-m antenna
4 Drawing of antenna showing feed indexer
5 Wide Band Single Pixel Feeds Considered in TDP 12m Offset Optics Design ATA Feed Lindgren Feed QSC Feed Eleven Feed
6 ATA Efficiency in a 12 meter antenna Subreflector Opening Angle Blue 45 degrees Red 51.6 degrees Purple 55 degrees Green 60 degrees Figure 7. ATA Calculated Feed (Efficiency in a 12-meter antenna)
7 QSC_i Calculated Feed (Efficiency in a 12-meter antenna) Subreflector opening angle Blue 55 degrees Red 65 degrees Purple 75 degrees
8 12m Offset Gregorian Design Shaped Geometries:
9 Variable Optics Variable subreflector opening angle with same main reflector
10 50 Degree Subreflector Opening Angle
11 Ray Trace Construction of New Subreflector With 55 degree opening angle Same 50 degree Main reflector
12 New subreflector, ~55 Opening Angle
13 Close up of New and Old Subreflector
14 12m Shaped Optical Design Aperture Efficiency PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
15 All Feeds: Aperture Efficiency vs. Frequency Aperture Efficiency [%] Normalized Frequency [f/fo]
16 12m Shaped Optical Design Antenna Noise Temperature PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
17 Main Noise Contributions in the Antenna Pattern Main Reflector Diffraction Cone Main Beam Sub Reflector Diffraction Cone
18 12m Shaped Optical Design Antenna Noise Temperature vs. Frequency PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
19 All Feeds: Antenna Noise T A vs. Frequency Antenna Noise Temperature [K] Frequency [GHz]
20 12m Shaped Optical Design Aeff/Tsys PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
21 All Feeds: A EFF /T SYS T RX =15K Aeff/Tsys [m 2 /K] Frequency [GHz]
22 Comparison to Octave Band Horn PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
23 Octave Band Horn (return loss) ( GHz) PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
24 Ae/Tsys for Octave band horn Horn Best? Wideband Feed PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
25 New Feed Work
26 New Quad-Ridged Horn in 15-m DVA_1 design
27 ATA Feed in Vacuum Bottle
28 Summary Shaping improves Aeff by 10% to 15% Shaped Aeff ~ 60% to 70% with WBSPF Ant. Noise Temp of ~10K, at zenith, optimized designs 12m Shp+WBSPF Aeff/Tsys ~2.5 to 3.5 m 2 /K (zenith). Aeff/Tsys significantly better with Octave Band Horn New Feed designs being considered
29 End PrepSKA WP2 Annual Meeting University of Oxford, UK, October 27-30, 2010
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