Feeders

• A Voltage Balun is one whose output voltages are equal and opposite (balanced with respect to ground)
• True balance occurs only if the balun’s load is symmetric with respect to ground
• Voltages baluns are easily constructed and commonly used in spite of their inability to provide true current balance
• A Current Balun is one whose output currents are equal and opposite (balanced with respect to ground)
• With the exception of the 1:1 current balun, current baluns are more expensive to construct than voltage baluns and thus are less widely used

Course Guide Topics

1. Purpose
2. Types of feeder
3. Characteristic Impedance
4. Parallel Conductor Line
5. Preventing Line Radiation
6. Balanced Line
7. Coaxial Line (Coax) (1)
8. Coaxial Line (Coax) (2)
9. Waveguide
10. Velocity Factor
11. Velocity Factor (Contd)
12. Terminated Line
    (Matched Case) (1)
13. Terminated Line
    (Matched Case) (2)
14. Terminated Line
    (Unmatched Case)
15. Standing Waves (1)
16. Standing Waves (2)
17. Standing Waves (3)
18. Line Loss (1)
19. Line Loss (2)
20. Matching
21. Matching – Quarter Wave Transformer (1)
22. Matching – Quarter Wave Transformer (2)
23. Lines as Tuned Circuits
24. Open Circuit
25. Short Circuit
26. Stubs
27. Stub Characteristics
28. Antenna Tuning Units – ATU
29. Balance/Unbalance
30. Baluns
31. Typical Baluns
32. 1:1 Current Balun
33. 4:1 Voltage Balun
34. 1:1 Voltage Balun
35. 4:1 Transmission Line Voltage Balun