1. The Design And Simulation of 7mm Ortho-mode Transducer Microwave Receiver Room Yunwei Ning

2. What is the polarization of electromagnetic wave? Vertical Horizontal Linearly Polarized Signals

3. What is the polarization of electromagnetic? Right Circular Left Circular Radio Astronomy Definition To convert linear to circular, a 90 degree phase-shifter is needed which retards one of the linear polarizations. Circularly Polarized Signals

4. Why do we need OMT? 垂直极化水平极化 V/H ( 垂直 / 水平 )

5. The location of OMT in the receiver and why is the OMT is so important? Feed Horns OMT LNA

6. OMT 45º Twist 90º Phase Shifter  →  Transition Mylar Window Circular Polarizer LO Ref 12-16.7 GHz @ 0 dBm Noise Diode Termination or Pulse Cal Input Magic Tee WG to Coax WG to Coax 22 dB KaDCM RF Post-Amp NF < 5 dB 8 dB IF Post-Amp NF < 2.5 dB x3 25-41 GHz 44-49 GHz RCP IF Output 8-18 GHz DC-18 GHz KaDCM x3 44-49 GHz LCP IF Output 8-18 GHz 22 dB RF Post-Amp NF < 5 dB 8 dB IF Post-Amp NF < 2.5 dB 25-41 GHz DC-18 GHz 35 dB LNA Coax to WG 2.9mm RCP Cal Coupler Quartz Window 2.9mm Coax to WG 35 dB LNA Quartz Window Cal Coupler LCP RF 26-40 GHz Thirteenth Synthesis Imaging Workshop - 2012 The location of OMT in the receiver and why is the OMT is so important?

7. The types of OMT CSIRO. Receiver Systems for Radio Astronomy

8. The types of OMT CSIRO. Receiver Systems for Radio Astronomy

9. What limit the bandwidth? CSIRO. Receiver Systems for Radio Astronomy

10. What limit the bandwidth? CSIRO. Receiver Systems for Radio Astronomy

11. What limit the bandwidth?

13. CSIRO. Receiver Systems for Radio Astronomy

14. What limit the bandwidth? CSIRO. Receiver Systems for Radio Astronomy TE (10) TE (2n+1 0) TE (10) TE (2n+1 2n)

15. Turnstile Junction Waveguide OMT CSIRO. Receiver Systems for Radio Astronomy

16. Turnstile Junction Pyramidal stub Square prism + pyramidal stub Cylindrical stub 2 cylinders conical stub 2 square prism

17. Turnstile Junction CSIRO. Receiver Systems for Radio Astronomy

18. E-plane bend CSIRO. Receiver Systems for Radio Astronomy

19. E-plane bend CSIRO. Receiver Systems for Radio Astronomy

20. Y-junction Power Combiner CSIRO. Receiver Systems for Radio Astronomy

21. Y-junction Power Combiner CSIRO. Receiver Systems for Radio Astronomy

22. 7-step Tchebyschev Transformer CSIRO. Receiver Systems for Radio Astronomy

23. simulation result of OMT CSIRO. Receiver Systems for Radio Astronomy VSWR 1.18(1.5) Insertion Loss 0.04dB(0.3) Orthogonal isolation -46dB(-30)

24. Electric field vectors CSIRO. Receiver Systems for Radio Astronomy

25. the evolution of Turnstile Junction OMT

26. The comparison of two bfai Junction OMT CSIRO. Receiver Systems for Radio Astronomy

27. Dual ridge bfai Junction OMT CSIRO. Receiver Systems for Radio Astronomy

28. The next year plan 7mm corrugated horn

29. The next year plan High Electron Mobility Transistor (HEMT) 7mm low noise amplifier

30. Thank you