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Microwave Electronic Devices

Microwave Electronic Devices. Microwave Electronics ECE 431. Emad Hegazi Associate Professor, ECE Emad.hegazi@eng.asu.edu.eg. Fall 2013. How to Contact Me. Email: Emad.hegazi@eng.asu.edu.edu Webpage http://portal.eng.asu.edu.eg/emadhegazi/content/sbsoid57954dio.php

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Microwave Electronic Devices

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  1. Microwave Electronic Devices Microwave Electronics ECE 431 Emad Hegazi Associate Professor, ECE Emad.hegazi@eng.asu.edu.eg Fall 2013

  2. How to Contact Me • Email: Emad.hegazi@eng.asu.edu.edu • Webpage http://portal.eng.asu.edu.eg/emadhegazi/content/sbsoid57954dio.php • Office hours on Saturday Microwave Electronics ECE 431 Fall 2013

  3. Cheating Policy It is very simple! • If you cheat you get a BIGFAT ZERO Microwave Electronics ECE 431 Fall 2013

  4. Lecture Room Rules • Lecture starts ON time exactly • If you find the door open, you may walk in without permission • If closed, go away. • Leave at any point in time without permission and without making up excuses • Eating and drinking inside the lecture room is OK. Just don’t eat something crunchy or smelly. Microwave Electronics ECE 431 Fall 2013

  5. References • For vacuum state devices: Samuel Liao1990 • For Parametric Amplifiers: Robert Collin2002 Microwave Electronics ECE 431 Fall 2013

  6. Prologue A Brief History of Microwave Devices

  7. The Grand Overture When he was about your age The genius who did it all Microwave Electronics ECE 431 Fall 2013 = James Clerk Maxwell 1831-1879

  8. Drive Microwave Electronics ECE 431 Fall 2013

  9. Then Came the Proof Microwave Electronics ECE 431 Fall 2013

  10. Brush Regularly Microwave Electronics ECE 431 Fall 2013

  11. Finally, Comes the Money • Engineers make money • Thomas Edison is the ultimate engineer Microwave Electronics ECE 431 Fall 2013

  12. Marconi and Radio • Got dragged into this by reading his professor’s tribute to Hertz Microwave Electronics ECE 431 Fall 2013

  13. How it All Started Microwave Electronics ECE 431 Fall 2013

  14. Amplifying Tube Microwave Electronics ECE 431 Fall 2013

  15. The First Computer: ENIAC Microwave Electronics ECE 431 Fall 2013

  16. The First Transistor Microwave Electronics ECE 431 Fall 2013

  17. Here Comes the Egyptian • John (Martin) Attalla and Dawon Khang 1960 • Attalla was born in Port Said, 1924 • MOS was done at Bell Labs Microwave Electronics ECE 431 Fall 2013

  18. OMG This is OoooooLD • Yes it is, BUT • Klystrons are still in use in military and in broadcast applications • Attempts at Stanford to build on-silicon Klystrons for Tera-Hz applications in 2010 • There are still some interesting concepts • Magnetrons are used in microwave ovens Microwave Electronics ECE 431 Fall 2013

  19. It is all about Output Power Microwave Electronics ECE 431 Fall 2013 Solid State

  20. Microwave Electronics ECE 431 Fall 2013

  21. Empty (Vacuum) state vs Solid State Microwave Electronics ECE 431 Fall 2013 Vacuum State Solid State

  22. Ladies and Gents:Let the Course Begin Microwave Electronics ECE 431 Fall 2013

  23. Content Empty state devices • Klystrons (Dr.NagdaElMeniawy) • Traveling Wave Tubes • Magnetrons • Parametric Amplifiers Solid State Devices (Dr. Ahmed Ashry) • IMPATT • TRAPPAT • Gunn diodes • HBT • HEMT Microwave Electronics ECE 431 Fall 2013

  24. Course Structure EH 1 Microwave Electronics ECE 431 EH,6 NM,3 AA, 9 Grading: Final exam 60% Mid-term 20% Sheets 10% Section effectiveness 10% Fall 2013

  25. Introducing Microwave Vacuum State Devices one-by-one Microwave Electronics ECE 431 Fall 2013

  26. Klystrons • Electron beam flow is modulated by the RF signal (Bunching). • Cavities are sort of resonators. • Can be use as amplifiers. • With proper feedback the device can be made to oscillate. Microwave Electronics ECE 431 Fall 2013

  27. Travelling Wave Tube (TWT) • A WWII radar component • Lower noise than Klystrons yet smaller and lighter Microwave Electronics ECE 431 • Electron gun; • RF input; • Magnets; • Attenuator; • Helix coil; • RF output; • Vacuum tube; • Collector. Fall 2013

  28. Travelling Wave Tube (TWT) • Helix structure slows wave down to interact with the beam This is condition when wave velocity = E-beam velocity Microwave Electronics ECE 431 Beam velocity Fall 2013

  29. Magnetrons Microwave Electronics ECE 431 Fall 2013

  30. W and W/O a Magnetic Field Microwave Electronics ECE 431 Fall 2013

  31. Parametric Amplifiers • A phenomena more than a device • Found in Vacuum state, Solid state or even photonics Microwave Electronics ECE 431 Fall 2013

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