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Which of the following is NOT true with respect to antennas?
- a)Lower frequencies are radiated near the end of transmission line
- b)Horn antennas are used to feed parabolic dish antennas
- c)Yagi-Uda antennas have high bandwidth and low gain
- d)Higher frequencies are radiated near the feedpoint
Correct answer is option 'C'. Can you explain this answer?
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Which of the following is NOT true with respect to antennas?a)Lower fr...
Yagi-Uda Antenna:
- It is a directional antenna and it consists of multiple parallel half-wave dipole elements.
- It is a directional antenna and it consists of multiple parallel half-wave dipole elements.
- The direction of maximum radiation is along the axis of the dipole array which is called an end-fire radiation pattern.
- The reflector and director are both parasitic types.
Characteristics:
- Usually, Yagi-Uda antenna arrays have low input impedance.
- It has a high gain.
- It has relatively low bandwidth.
- The length of the director is less than λ/2
- The length of the reflector is greater than λ/2.
- Its radiation pattern is almost uni-directional.
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Which of the following is NOT true with respect to antennas?a)Lower fr...
Introduction:
Antennas are devices used for transmitting and receiving electromagnetic waves. They are an essential component of communication systems and are used to radiate electromagnetic energy into the surrounding space or to receive electromagnetic signals. In this question, we need to identify the statement that is NOT true with respect to antennas.
Explanation:
Let's analyze each option and determine its validity.
a) Lower frequencies are radiated near the end of the transmission line:
This statement is generally true. At lower frequencies, the wavelength is larger, and antennas that are electrically small compared to the wavelength tend to radiate more efficiently when placed at the end of the transmission line. Therefore, lower frequencies are often radiated near the end of the transmission line.
b) Horn antennas are used to feed parabolic dish antennas:
This statement is true. Horn antennas are often used as feed antennas for parabolic dish antennas. They are designed to have a wide radiation pattern and direct the electromagnetic energy towards the parabolic dish, which further focuses the energy in a specific direction.
c) Yagi-Uda antennas have high bandwidth and low gain:
This statement is NOT true. Yagi-Uda antennas have a relatively narrow bandwidth, which means they are designed to operate effectively over a specific frequency range. However, they are known for their high gain, which refers to the ability of an antenna to focus the radiated energy in a specific direction.
d) Higher frequencies are radiated near the feedpoint:
This statement is generally true. At higher frequencies, the wavelength is smaller, and antennas that are electrically small compared to the wavelength tend to radiate more efficiently when placed near the feedpoint. Therefore, higher frequencies are often radiated near the feedpoint.
Conclusion:
Based on the analysis, option 'c' is the statement that is NOT true with respect to antennas. Yagi-Uda antennas have high gain and a relatively narrow bandwidth, contrary to the statement provided.
Antennas are devices used for transmitting and receiving electromagnetic waves. They are an essential component of communication systems and are used to radiate electromagnetic energy into the surrounding space or to receive electromagnetic signals. In this question, we need to identify the statement that is NOT true with respect to antennas.
Explanation:
Let's analyze each option and determine its validity.
a) Lower frequencies are radiated near the end of the transmission line:
This statement is generally true. At lower frequencies, the wavelength is larger, and antennas that are electrically small compared to the wavelength tend to radiate more efficiently when placed at the end of the transmission line. Therefore, lower frequencies are often radiated near the end of the transmission line.
b) Horn antennas are used to feed parabolic dish antennas:
This statement is true. Horn antennas are often used as feed antennas for parabolic dish antennas. They are designed to have a wide radiation pattern and direct the electromagnetic energy towards the parabolic dish, which further focuses the energy in a specific direction.
c) Yagi-Uda antennas have high bandwidth and low gain:
This statement is NOT true. Yagi-Uda antennas have a relatively narrow bandwidth, which means they are designed to operate effectively over a specific frequency range. However, they are known for their high gain, which refers to the ability of an antenna to focus the radiated energy in a specific direction.
d) Higher frequencies are radiated near the feedpoint:
This statement is generally true. At higher frequencies, the wavelength is smaller, and antennas that are electrically small compared to the wavelength tend to radiate more efficiently when placed near the feedpoint. Therefore, higher frequencies are often radiated near the feedpoint.
Conclusion:
Based on the analysis, option 'c' is the statement that is NOT true with respect to antennas. Yagi-Uda antennas have high gain and a relatively narrow bandwidth, contrary to the statement provided.
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Which of the following is NOT true with respect to antennas?a)Lower frequencies are radiated near the end of transmission lineb)Horn antennas are used to feed parabolic dish antennasc)Yagi-Uda antennas have high bandwidth and low gaind)Higher frequencies are radiated near the feedpointCorrect answer is option 'C'. Can you explain this answer?
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