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Subel. 7
11 questions
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Subelement 7

Feedlines - Matching and Antennas

Section 7-01

antenna tuner/transmatch, impedance matching circuits

For an antenna tuner of the "Transformer" type, which of the following statements is False?

  • The input is suitable for 50 ohm impedance
  • The output is suitable for impedances from low to high
  • Correct Answer
    The circuit is known as a Pi-type antenna tuner (transmatch)
  • The circuit is known as a transformertype antenna tuner (transmatch)
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For an antenna tuner of the "Series" type, which of the following statements is False?

  • The circuit is known as a Series-type antenna tuner (transmatch)
  • The output is suitable for impedances from low to high
  • The input is suitable for impedance of 50 ohms
  • Correct Answer
    The circuit is known as a Pi-type antenna tuner (transmatch)
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For an antenna tuner of the "L" type, which of the following statements is False?

  • The transmitter input is suitable for 50 ohms impedance
  • The antenna output is high impedance
  • Correct Answer
    The circuit is suitable for matching to a vertical groundplane antenna
  • The circuit is known as an L-type antenna tuner (transmatch)
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For an antenna tuner of the "Pi" type, which of the following statements is False?

  • The transmitter input is suitable for impedance of 50 ohms
  • The antenna output is suitable for impedances from low to high
  • Correct Answer
    The circuit is a series-type antenna tuner (transmatch)
  • The circuit is a Pi-type antenna tuner (transmatch)
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What is a pi-network?

  • An antenna matching network that is isolated from ground
  • A network consisting of four inductors or four capacitors
  • Correct Answer
    A network consisting of one inductor and two capacitors or two inductors and one capacitor
  • A power incidence network
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Which type of network offers the greatest transformation ratio?

  • Chebyshev
  • Butterworth
  • Correct Answer
    Pi-network
  • L-network
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Why is an L-network of limited utility in impedance matching?

  • It is thermally unstable
  • Correct Answer
    It matches only a small impedance range
  • It is prone to self-resonance
  • It has limited power handling capability
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How does a network transform one impedance to another?

  • It produces transconductance to cancel the reactive part of an impedance
  • It introduces negative resistance to cancel the resistive part of an impedance
  • Correct Answer
    It cancels the reactive part of an impedance and changes the resistive part
  • Network resistances substitute for load resistances
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What advantage does a pi-L network have over a pi-network for impedance matching between a vacuum tube linear amplifier and a multiband antenna?

  • Correct Answer
    Greater harmonic suppression
  • Higher efficiency
  • Lower losses
  • Greater transformation range
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Which type of network provides the greatest harmonic suppression?

  • Inverse pi-network
  • Pi-network
  • Correct Answer
    Pi-L network
  • L-network
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Which three types of networks are most commonly used to match an RF power amplifier to a transmission line?

  • T, M and Q
  • M, pi and T
  • Correct Answer
    L, pi and pi-L
  • L, M and C
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