Ka band feed design and prototype tests
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Ka-Band Feed Design and Prototype Tests. S. Srikanth NRAO/Charlottesville. EVLA Receiver Bands. Ka-Band Feed Details. Corrugations Total = 181 Ring-loaded = 5 Pitch = 0.074 Flange width = 0.024 Corrug. width = 0.050 No. per λ = 4.8.

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Ka band feed design and prototype tests l.jpg

Ka-Band FeedDesign and Prototype Tests

S. Srikanth

NRAO/Charlottesville



Slide3 l.jpg

Ka-Band FeedDetails

Corrugations

Total = 181

Ring-loaded = 5

Pitch = 0.074

Flange width = 0.024

Corrug. width = 0.050

No. per λ = 4.8

Aperture ID = 5.44 (15.2λ)

Aperture OD = 6.25

Length = 14.3 (40λ)

Input Dia. = 0.352

Ө input = 8°

Ө feed = 10.83°

(all dimensions = inches)


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NRAO Anechoic Chamber Antenna Range

  • 8 GHz to 115 GHz

  • 37′ x 15′ x 15′

  • 8″ pyramidal absorbers - center of walls

  • 6″ pyramidal absorbers - others

  • 2′ sphere quiet zone 7 ¼′ from rear & side walls

  • 2 to 50 GHz 8530A receiver (Agilent Technologies)

  • 60 to 115 GHz Oleson Microwave mm heads

  • 8360B synthesized sweeper

  • Positioner/controller hardware & software ORBIT/FR











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