S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 EVLA FEEDS DESIGN S. Srikanth NRAO/Charlottesville.

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Presentation transcript:

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 EVLA FEEDS DESIGN S. Srikanth NRAO/Charlottesville

VLA Cassegrain Geometry Drawing

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Current Receiver Bands

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 VLA Vertex Feed Cone

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 EVLA Receiver Bands

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Selection of Bands Minimize number of receivers Use existing technology Performance at the band edges - feeds, polarizers, amplifiers etc.

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Selection of Feed Type and Parameters Nominal taper of -13 dB at 9.25 degrees Compact horns where space is limited Ring-loaded slots (except for Q-band) Number of corrugations/wavelength - 3.8

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Conventional Corrugations

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Ring-Loaded Corrugations

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 VSWR – Conventional and Ring-Loaded

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Linear Taper Horn 75" OD – 1.0 GHz

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Linear Taper Horn 75" OD – 1.4 GHz

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of 75" OD and 62" OD Feeds

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn – 75" OD 1.0 GHz

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn – 62" OD 1.0 GHz

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn – 75" OD 1.4 GHz

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn – 62" OD 1.4 GHz

VLA Cassegrain Geometry Drawing

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 ANALYSIS METHODOLOGY

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 ANALYSIS METHODOLOGY  =  /  max  =  /sin  max 6. Grids on the reflector surface

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of Subreflector Patterns at 1.5 GHz (  = 0°) JPL Software NRAO Software

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of Subreflector Patterns at 1.5 GHz (  = 90°) JPL SoftwareNRAO Software

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of Main Reflector Patterns at GHz Measured NRAO Software

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 75" OD Symmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 62" OD Symmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 75" OD Asymmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 62" OD Asymmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 62" OD Symmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 1.4 GHz Compact Horn - 62" OD Asymmetric Plane

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Main Reflector Pattern – 1.4 GHz Compact Horn - 75" OD

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Main Reflector Pattern – 1.4 GHz Compact Horn - 62" OD

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of 75" OD and 62" OD Feeds

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn –75" OD

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Compact Horn – 62" OD

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of 75" OD and 62" OD Feeds

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of 75" OD and 62" OD Feeds

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison of 75" OD and 62" OD Feeds

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 The hybrid lens feed

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Measured Pattern – Current Feed

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Corrected Pattern – Current Feed

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Measured Pattern – Current Feed

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Corrected Pattern – Current Feed

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Comparison: New Design & Current Feed L-Band

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 3.0 GHz -11 dB Taper

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Subreflector Scatter Pattern – 3.0 GHz -18 dB Taper

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Gain/T sys Analysis

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Gain/T sys Analysis

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Gain/T sys Analysis

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 EVLA – Predicted Performance

S. SrikanthEVLA Feed/FE PDR February 12-13, 2002 Future Work