BasicB-006-001-002
The characteristic impedance of a transmission line is determined by the:
B
Answer
Antennas and feed lines
Type
A
length of the line
B
physical dimensions and relative positions of the conductors
C
load placed at the end of the line
D
frequency at which the line is operated
Answer Notes
The characteristic impedance of a transmission line is an intrinsic property tied entirely to its physical geometry and materials. This includes the diameters of the conductors, the distance or spacing between them, and the dielectric (insulating) material used.
Because it is determined during the manufacturing process by these physical dimensions, external factors do not alter it. The length of the line, the operating frequency, and the load (antenna) placed at the end have absolutely no effect on the cable's inherent characteristic impedance.
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The characteristic impedance of a 20-metre piece of transmission line is 52 ohms. What would the impedance be if 10 metres were cut off?