EVLA – Polarizers for X, K u , K and K a Bands
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S. Srikanth EVLA Feed/FE PDR February 12-13, 2002 EVLA – Polarizers for X, K u , K and K a Bands S. Srikanth NRAO/Charlottesville
description
EVLA – Polarizers for X, K u , K and K a Bands. S. Srikanth NRAO/Charlottesville. Circular Polarization. Circular Polarization. Contours of Constant Axial Ratio vs. Amplitude and Phase Error. Septum Polarizer. Septum Polarizer. Septum Polarizer 12-15.4 GHz. Return Loss. - PowerPoint PPT Presentation
Transcript of EVLA – Polarizers for X, K u , K and K a Bands
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
EVLA – Polarizers for X, Ku, K and Ka Bands
S. SrikanthNRAO/Charlottesville
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Circular Polarization
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Circular Polarization
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Contours of Constant Axial Ratio vs. Amplitude and Phase Error
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Septum Polarizer
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Septum Polarizer
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Septum Polarizer12-15.4 GHz
Return Loss Deviation of from 90°
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Conventional Polarizer
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Mode Combiner/Splitter(18-26.5 GHz)
OMT – 18-26.5 GHz
Boifot et. al., Proc. IEE, vo1. 137, Dec. '90.
Wollack, EDIR #303, May '96.
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Phase Shifter
Phase Shifter(a) Dispersion characteristics; (b) Differential phase shift vs. the frequency
Corrugated/Dielectric Phase Shifter(a) Dispersion characteristics; (b) Differential phase shift vs. the frequency
Lier et. al., IEEE MTT, vol. 36, Nov. '88.
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
Corrugated Phase Shifter
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter(18-26.5 GHz)
Srikanth, IEEE Microwave & Guided-Wave Ltrs., vol. 7, June '97.
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter (18-26.5 GHz)
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter (18-26.5 GHz)Measured
Differential Phase Shift
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter (18-26.5 GHz)
Measured S11, S12
Return Loss Insertion Loss
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter(26.5-40 GHz)
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter (26.5-40 GHz)Measured
Differential Phase Shift
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
NRAO Phase Shifter(26.5-40 GHz)
Measured S11, S12
Return Loss Insertion Loss
S. Srikanth EVLA Feed/FE PDRFebruary 12-13, 2002
EVLA Phase Shifters
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