E9G06
ANTENNAS AND TRANSMISSION LINES · The Smith chart
E9G06E9G →
On the Smith chart shown in Figure E9-3, what is the name for the large outer circle on which the reactance arcs terminate?
- APrime axis
- BReactance axis
- CImpedance axis
- DPolar axis
Why On a Smith chart the family of curved reactance arcs all begin and end on the big circle that bounds the chart, so that outermost circle is called the reactance axis. It represents the locus of zero resistance (pure reactance), which is why every arc of constant reactance terminates there. The straight horizontal line through the middle is the other principal axis, the resistance axis, where reactance is zero.
Watch out The choice naming it the resistance axis fits the straight horizontal center line, not the outer circle, and 'prime axis' and 'polar axis' are not Smith chart terms at all.
Curved reactance arcs end on the curved outer circle: reactance axis. Straight line across the middle: resistance axis.
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?