Resonant Antennas and Dipole Antennas Quiz
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Questions and Answers

What type of antenna can be described as an opened-out transmission line open-circuited at the far end and of resonant length?

  • Half-wave dipole
  • Wire radiator
  • Full-wave dipole
  • Resonant antenna (correct)
  • In a resonant antenna, why is the length chosen to be a multiple of quarter-wavelengths?

  • To create lobes in the radiation pattern
  • To achieve resonance (correct)
  • To ensure opposite current polarities on each half
  • To maximize field cancellation
  • What happens to the radiation at right angles from a full-wave dipole antenna?

  • It is zero (correct)
  • It is flattened
  • It is focused
  • It is maximized
  • What is the direction of maximum radiation for a full-wave dipole antenna?

    <p>54° to the antenna</p> Signup and view all the answers

    How does the length of an antenna affect its radiation pattern in free space?

    <p>Changes the shape of the lobes</p> Signup and view all the answers

    What does it mean when the polarity of current on one half of an antenna is opposite to that on the other half?

    <p>Zero radiation at right angles</p> Signup and view all the answers

    What does the term 'radiation resistance' refer to in the context of antennas?

    <p>The power that an antenna radiates into free space relative to the driving power supplied to the antenna.</p> Signup and view all the answers

    How does the AC resistance of the transmission line impact the overall impedance and power delivered to the antenna?

    <p>AC resistance impacts the overall impedance that the antenna sees, which affects the power delivered to the antenna.</p> Signup and view all the answers

    What is the purpose of a parallel-tuned circuit in radio communication systems?

    <p>To adjust the resonant frequency of the antenna for optimal radiation resistance and efficient operation.</p> Signup and view all the answers

    How does the radiation resistance of an antenna change with different operating conditions?

    <p>The radiation resistance remains constant across different operating conditions.</p> Signup and view all the answers

    What is the relationship between the current at the feed point of an antenna and its radiation resistance?

    <p>The radiation resistance increases as the current at the feed point increases.</p> Signup and view all the answers

    If an antenna needs to be replaced, what is the most important consideration for the replacement antenna?

    <p>The radiation resistance of the replacement antenna.</p> Signup and view all the answers

    What is the primary function of the radiation resistance in an antenna system?

    <p>To convert the current flowing at the feed point into radiated electromagnetic energy</p> Signup and view all the answers

    Why is understanding the impact of radiation resistance crucial when designing or modifying antenna systems?

    <p>To optimize the antenna's performance in terms of signal quality, coverage, and overall system efficiency</p> Signup and view all the answers

    What is the purpose of adjusting the values of capacitors and inductors in an antenna circuit?

    <p>To fine-tune the antenna's performance to meet specific requirements</p> Signup and view all the answers

    What is the significance of the a.c. resistance in an antenna system?

    <p>It affects the antenna's ability to radiate electromagnetic energy efficiently</p> Signup and view all the answers

    In a parallel-tuned circuit used in antenna systems, what is the purpose of the inductor and capacitor?

    <p>To adjust the resonant frequency of the circuit to the desired operating frequency</p> Signup and view all the answers

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