Transmission Lines Concepts Quiz
11 Questions
1 Views

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to lesson

Podcast

Play an AI-generated podcast conversation about this lesson

Questions and Answers

What is the reflection coefficient for best matching?

  • should be negative
  • equal to infinity
  • equal to zero (correct)
  • equal to one

    • Which of the following contributes to the reflected voltage?

  • all of the choices (correct)
  • Zo
  • propagation constant
  • length

    • What is the reflection coefficient of an open-circuited line?

  • infinite
  • 1 (correct)
  • -1
  • 0

    • What is the term for the interference of two waves going in opposite directions?

    <p>standing waves (D)</p> Signup and view all the answers

    In a step-up quarter-wave transformer matching, the load resistance is expected to be:

    <p>less than characteristic impedance (B)</p> Signup and view all the answers

    The impedance at the termination of a shorted line is:

    <p>minimum (A)</p> Signup and view all the answers

    Which expression represents the relationship of the reflection coefficients?

    <p>$ Gamma_{v} &lt; Gamma_{i} = \sqrt{Gamma_{p}}$ (C)</p> Signup and view all the answers

    Which statement is NOT characteristic of a microstrip transmission line?

    <p>sandwiched between two ground planes (D)</p> Signup and view all the answers

    What is the first step in using the Smith Chart?

    <p>normalize the load impedance (C)</p> Signup and view all the answers

    An open-circuited transmission line behaves like which component?

    <p>capacitor (B)</p> Signup and view all the answers

    In stub matching, the stub is placed ______ the primary line

    <p>across</p> Signup and view all the answers

    Study Notes

    Transmission Lines Exam Questions

    • Part 1: Matching

      • For best matching, the reflection coefficient should be equal to zero.
      • The reflection coefficient should not be equal to one, infinity or a negative value

    • Contributing Factors

      • The reflection coefficient depends on the propagation constant and characteristic impedance (Zo).
      • Incident voltage is affected by the propagation constant.
      • The incident current is affected by the transmission line's length.

    • Open-Circuited Line Reflection Coefficient

      • An open-circuited line has a reflection coefficient of -1.

    • Interference of Waves

      • Standing waves are created by the interference of incident and reflected waves that travel in opposite directions.

    • Minimum Impedance

      • The minimum impedance in a transmission line is determined by the ratio of the minimum voltage to the maximum current (Vmin/Imax).

    • Open and Short Circuits

      • In an open circuit configuration, the sum of incident voltage and reflected voltage is at a maximum value.
      • In a short circuit configuration, the sum of incident current and reflected current is maximum.

    • Impedance at Line Termination

      • The impedance at the termination of a shorted line is undefined.

    • Quarter-Wave Transmission Line Termination

      • The impedance of a quarter-wave transmission line terminated in an open circuit acts as a capacitor

    • Half-Wavelength Transmission Line Termination

      • The impedance of half-wavelength transmission line terminated in an open circuit acts as a series resonant circuit

    • λ/8 Transmission Line Termination

      • The impedance of a λ/8 transmission line terminated in an open circuit acts as a capacitor

    • 3λ/8 Transmission Line Termination

      • The impedance of a 3λ/8 transmission line terminated in a short circuit acts as a parallel resonant circuit.

    • Inductive and/or capacitive line

      • If the transmission line is purely inductive or capacitive, the minimum voltage(Vmin) will appear before Smax.

    • Stub Matching

      • In a step-up quarter-wave transformer matching configuration, the load resistance (RL) is greater than the characteristic impedance (Zo).
      • The stub is placed away from the primary line.

    • Smith Chart Usage

      • The first step when using a Smith chart is to draw the impedance circle.

    • Microstrip Characteristics

      • Microscopic transmission lines are constructed with a high-grade printed circuit and have an insulating substrate.

    • Reflection Coefficient Relationship

      • The relationship between incident and reflected voltage, and reflection coefficients, is determined by the characteristic impedance and the impedance of the load.

    • Expressions for Reflection Coefficient

      • Not all expressions below represent the reflection coefficient;
      • Multiple expressions determine the reflection coefficient values.

    • Determining First Voltage Maximum Position

      • The position of the first maximum voltage is determined by certain equations.

    Studying That Suits You

    Use AI to generate personalized quizzes and flashcards to suit your learning preferences.

    Quiz Team

    Description

    Test your knowledge on transmission line parameters and the reflection coefficient. This quiz covers key concepts such as impedance, wave interference, and open-circuited line behaviors. Brush up on your understanding of how these elements interact in transmission lines for effective communication.

    More Like This

    Use Quizgecko on...
    Browser
    Open
    Browser
    Browser