Question
On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?
Answer Options
- A) Prime axis
- B) Reactance axis
- C) Impedance axis
- D) Polar axis
Correct Answer: B
Explanation
Figure E9-3 shows the structure of a Smith chart. The chart is constructed such that the resistance circles begin at the outer perimeter and converge inward. The arcs of constant reactance start on the straight, horizontal axis and sweep toward the perimeter of the chart.
The large outer circle on which the reactance arcs terminate is defined as the zero resistance circle, representing purely reactive loads. This perimeter is named the Reactance axis because the values along this circumference represent every possible value of pure capacitive (bottom half) or pure inductive (top half) reactance.
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