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Ka-Band Feed Design and Prototype Tests

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

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  1. Ka-Band FeedDesign and Prototype Tests S. Srikanth NRAO/Charlottesville

  2. EVLA Receiver Bands

  3. 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)

  4. 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

  5. NRAO Anechoic Chamber Antenna Range

  6. Theory & Measured 26 GHz

  7. Theory & Measured 34 GHz

  8. Theory & Measured 40 GHz

  9. Measured E- & H-Plane Patterns - 34.0 GHz

  10. Co- & X-Polarized Field Patterns - Measured

  11. Measured Phase Patterns

  12. Measured Return Loss

  13. Ka-Band Feed Summary

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