E9G07
ANTENNAS AND TRANSMISSION LINES · The Smith chart
E9G07E9G →
On the Smith chart shown in Figure E9-3, what is the only straight line shown?
- AThe reactance axis
- BThe current axis
- CThe voltage axis
- DThe resistance axis
Why On a Smith chart every constant-reactance curve is an arc of a circle, and every constant-resistance contour is a full circle tangent to the chart's outer rim. The single exception is the horizontal line running through the center from the short-circuit point to the open-circuit point, which is the pure-resistance (zero reactance) locus. A straight line is just a circle of infinite radius, and that is the only one drawn on the chart.
Watch out The reactance axis is tempting because it is the other named axis, but reactance appears as curved arcs sweeping off the outer circle, inductive above the center line and capacitive below.
Straight and level across the middle = pure resistance, no reactance. Everything else on a Smith chart curves.
HamSandwich explanation, first draft. The question and answers are the NCVEC text.
The rest of E9G
- E9G01 Which of the following can be calculated using a Smith chart?
- E9G02 What type of coordinate system is used in a Smith chart?
- E9G03 Which of the following is often determined using a Smith chart?
- E9G04 What are the two families of circles and arcs that make up a Smith chart?
- E9G05 Which of the following is a common use for a Smith chart?
- E9G06 On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance a…
- E9G07 On the Smith chart shown in Figure E9-3, what is the only straight line shown?
- E9G08 How is a Smith chart normalized?
- E9G09 What third family of circles is often added to a Smith chart during the process of designing impedance matchi…
- E9G10 What do the arcs on a Smith chart represent?
- E9G11 In what units are the wavelength scales on a Smith chart calibrated?