Question
In what units are the wavelength scales on a Smith chart calibrated?
Answer Options
- A) In fractions of transmission line electrical frequency
- B) In fractions of transmission line electrical wavelength
- C) In fractions of antenna electrical wavelength
- D) In fractions of antenna electrical frequency
Correct Answer: B
Explanation
The edge of the Smith chart contains scales used to determine the electrical length of a transmission line, which is necessary for moving a plotted impedance point along the line toward the generator or the load. These scales are measured in units of wavelength and are relative to the signal speed in the cable.
The wavelength scales on a Smith chart are calibrated in fractions of transmission line electrical wavelength (e.g., 0.0 to 0.5 wavelengths). This electrical length automatically incorporates the transmission line’s velocity factor (VF), allowing the chart to accurately model the phase change that occurs as the signal propagates along the physical length of the line.
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