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

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Presentation on theme: "EVLA – Polarizers for X, Ku, K and Ka Bands"— Presentation transcript:

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

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

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

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

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

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

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

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

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

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

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

12 Phase Shifter (a) Dispersion characteristics; (b) Differential phase shift vs. the frequency

13 Corrugated/Dielectric Phase Shifter (a) Dispersion characteristics; (b) Differential phase shift vs. the frequency Lier et. al., IEEE MTT, vol. 36, Nov. '88.

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

15 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

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

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

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

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

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

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

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


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