Topic: Microwave Engineering
Main function of helix structure in a Travelling Wave Tube (TWT) is
- A. To reduce axial velocity of RF field.
- B. To reduce noise figure of TWT.
- C. To properly focus electron beam.
- D. To reduce axial velocity of electron.
Answer: A. To reduce axial velocity of RF field.
Explanation: Main purpose of helix structure in TWT is make axial velocity of RF field equals to electron beam velocity so as to transfer the energy over entire length.