EVLA – Polarizers for X, Ku, K and Ka Bands

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Presentation transcript:

EVLA – Polarizers for X, Ku, K and Ka Bands S. Srikanth NRAO/Charlottesville S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Circular Polarization S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Circular Polarization S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Contours of Constant Axial Ratio vs. Amplitude and Phase Error S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Septum Polarizer S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Septum Polarizer S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Septum Polarizer 12-15.4 GHz Return Loss Deviation of  from 90° S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Conventional Polarizer S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

Mode Combiner/Splitter (18-26.5 GHz) S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

OMT – 18-26.5 GHz Boifot et. al., Proc. IEE, vo1. 137, Dec. '90. Wollack, EDIR #303, May '96.

Phase Shifter S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

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.

Corrugated Phase Shifter S. Srikanth EVLA Feed/FE PDR February 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 PDR February 12-13, 2002

NRAO Phase Shifter (18-26.5 GHz) S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

NRAO Phase Shifter (18-26.5 GHz) Measured  Differential Phase Shift S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

NRAO Phase Shifter (18-26.5 GHz) Measured S11, S12 Return Loss Insertion Loss S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

NRAO Phase Shifter (26.5-40 GHz) S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

NRAO Phase Shifter (26.5-40 GHz) Measured  Differential Phase Shift S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

NRAO Phase Shifter (26.5-40 GHz) Measured S11, S12 Return Loss Insertion Loss S. Srikanth EVLA Feed/FE PDR February 12-13, 2002

EVLA Phase Shifters S. Srikanth EVLA Feed/FE PDR February 12-13, 2002