Resonant Antennas and Dipole Antennas Quiz

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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?

54° to the antenna Signup and view all the answers

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

Changes the shape of the lobes 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?

Zero radiation at right angles Signup and view all the answers

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

The power that an antenna radiates into free space relative to the driving power supplied to the antenna. 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?

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

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

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

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

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

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

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

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

The radiation resistance of the replacement antenna. Signup and view all the answers

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

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

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

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

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

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

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

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

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

To adjust the resonant frequency of the circuit to the desired operating frequency Signup and view all the answers

Resonant Antennas and Dipole Antennas Quiz

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