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A transmission line having characteristic impedance ‘Z1’ of varying length in series with a load impedance  ‘ZL’ appears in a Smith Chart on
  • a)
    Constant Resistance Circle
  • b)
    Constant VSWR circle
  • c)
    Constant Reactance Circle
  • d)
    All of the above
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A transmission line having characteristic impedance ‘Z1’ o...
The reflection coefficient at the load is defined as:
, where ZL = load impedance and Z0 = characteristic impedance.
Also, VSWR = 
Clearly, VSWR is a function of ZL and Z0.
For the given transmission line, Z0 = Zt and ZL = ZL
So, VSWR is constant and it doesn’t change with the length of the line, In the smith chart, this is represented as a constant VSWR circle.
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