Podcast
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?
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?
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?
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?
What is the direction of maximum radiation for a full-wave dipole antenna?
How does the length of an antenna affect its radiation pattern in free space?
How does the length of an antenna affect its radiation pattern in free space?
What does it mean when the polarity of current on one half of an antenna is opposite to that on the other half?
What does it mean when the polarity of current on one half of an antenna is opposite to that on the other half?
What does the term 'radiation resistance' refer to in the context of antennas?
What does the term 'radiation resistance' refer to in the context of antennas?
How does the AC resistance of the transmission line impact the overall impedance and power delivered to the antenna?
How does the AC resistance of the transmission line impact the overall impedance and power delivered to the antenna?
What is the purpose of a parallel-tuned circuit in radio communication systems?
What is the purpose of a parallel-tuned circuit in radio communication systems?
How does the radiation resistance of an antenna change with different operating conditions?
How does the radiation resistance of an antenna change with different operating conditions?
What is the relationship between the current at the feed point of an antenna and its radiation resistance?
What is the relationship between the current at the feed point of an antenna and its radiation resistance?
If an antenna needs to be replaced, what is the most important consideration for the replacement antenna?
If an antenna needs to be replaced, what is the most important consideration for the replacement antenna?
What is the primary function of the radiation resistance in an antenna system?
What is the primary function of the radiation resistance in an antenna system?
Why is understanding the impact of radiation resistance crucial when designing or modifying antenna systems?
Why is understanding the impact of radiation resistance crucial when designing or modifying antenna systems?
What is the purpose of adjusting the values of capacitors and inductors in an antenna circuit?
What is the purpose of adjusting the values of capacitors and inductors in an antenna circuit?
What is the significance of the a.c. resistance in an antenna system?
What is the significance of the a.c. resistance in an antenna system?
In a parallel-tuned circuit used in antenna systems, what is the purpose of the inductor and capacitor?
In a parallel-tuned circuit used in antenna systems, what is the purpose of the inductor and capacitor?
