Ka-Band Feed Design and Prototype Tests

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Presentation transcript:

Ka-Band Feed Design and Prototype Tests S. Srikanth NRAO/Charlottesville S. Srikanth

EVLA Receiver Bands S. Srikanth

Ka-Band Feed Details 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) Corrugations Total = 181 Ring-loaded = 5 Pitch = 0.074 Flange width = 0.024 Corrug. width = 0.050 No. per λ = 4.8

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 S. Srikanth

NRAO Anechoic Chamber Antenna Range S. Srikanth

Theory & Measured 26 GHz S. Srikanth

Theory & Measured 34 GHz S. Srikanth

Theory & Measured 40 GHz S. Srikanth

Measured E- & H-Plane Patterns - 34.0 GHz S. Srikanth

Co- & X-Polarized Field Patterns - Measured S. Srikanth

Measured Phase Patterns Phase Center Distance (ins) Freq. GHz Meas. Theory 26.0 8.8 10.3 34.0 10.8 11.8 40.0 12.4 12.6 S. Srikanth

Measured Return Loss S. Srikanth

Ka-Band Feed Summary S. Srikanth