Feeders
Course Guide Topics
Purpose
Types of feeder
Characteristic Impedance
Parallel Conductor Line
Preventing Line Radiation
Balanced Line
Coaxial Line (Coax) (1)
Coaxial Line (Coax) (2)
Waveguide
Velocity Factor
Velocity Factor (Contd)
Terminated Line (Matched Case) (1)
Terminated Line (Matched Case) (2)
Terminated Line (Unmatched Case)
Standing Waves (1)
Standing Waves (2)
Standing Waves (3)
Line Loss (1)
Line Loss (2)
Matching
Matching – Quarter Wave Transformer (1)
Matching – Quarter Wave Transformer (2)
Lines as Tuned Circuits
Open Circuit
Short Circuit
Stubs
Stub Characteristics
Antenna Tuning Units – ATU
Balance/Unbalance
Baluns
Typical Baluns
1:1 Current Balun
4:1 Voltage Balun
1:1 Voltage Balun
4:1 Transmission Line Voltage Balun
Open Circuit
With an open circuit line the open circuit appears at half wavelength intervals from the load
At quarter wavelength intervals the open circuit is
transformed
into a short circuit
Course Guide Topics
Purpose
Types of feeder
Characteristic Impedance
Parallel Conductor Line
Preventing Line Radiation
Balanced Line
Coaxial Line (Coax) (1)
Coaxial Line (Coax) (2)
Waveguide
Velocity Factor
Velocity Factor (Contd)
Terminated Line
(Matched Case) (1)
Terminated Line
(Matched Case) (2)
Terminated Line
(Unmatched Case)
Standing Waves (1)
Standing Waves (2)
Standing Waves (3)
Line Loss (1)
Line Loss (2)
Matching
Matching – Quarter Wave Transformer (1)
Matching – Quarter Wave Transformer (2)
Lines as Tuned Circuits
Open Circuit
Short Circuit
Stubs
Stub Characteristics
Antenna Tuning Units – ATU
Balance/Unbalance
Baluns
Typical Baluns
1:1 Current Balun
4:1 Voltage Balun
1:1 Voltage Balun
4:1 Transmission Line Voltage Balun