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
Matching – Quarter Wave Transformer (2)
In above case aerial impedance of 5000Ω has to be matched to 72Ω balanced line
Z
stub
= √
(Z
antenna
× Z
feeder
)
= √
5000 × 72
= 600Ω
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