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For a dipole antenna
- a)The radiation intensity is maximum along the normal to the dipole axis
- b)The current distribution along its length is uniform irrespective of the length
- c)The effective length equals its physical length
- d)The input impedance is independent of the location of the feed – point
Correct answer is option 'A'. Can you explain this answer?
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For a dipole antennaa)The radiation intensity is maximum along the nor...
A dipole antenna is a linear antenna, usually fed in the center and producing maximum of radiation in the plane normal to the axis. It is said to be short dipole when length is less than λ/4 and current distribution is sinusoidal. Radiation intensity is maximum along the normal to the dipole axis.
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For a dipole antennaa)The radiation intensity is maximum along the nor...
Understanding Dipole Antenna Radiation
Dipole antennas are widely used in communication systems. When analyzing their radiation pattern, it's crucial to understand the characteristics that affect their performance.
Maximum Radiation Intensity
- The radiation intensity of a dipole antenna is indeed maximum along the plane perpendicular to its axis.
- This is due to the dipole's radiation pattern, which is doughnut-shaped. The antenna radiates more effectively in directions orthogonal to its length.
Current Distribution
- The current distribution along a dipole antenna is not uniform. In practice, the current varies along the length of the dipole, typically peaking at the center and tapering off toward the ends.
- This non-uniformity is especially pronounced in electrically short dipoles.
Effective Length vs. Physical Length
- The effective length of a dipole can differ from its physical length. Factors such as frequency and the presence of nearby objects can alter the effective length, impacting its impedance and radiation characteristics.
Input Impedance and Feed-point Location
- The input impedance of a dipole antenna varies based on the feed-point location. For example, feeding at the center results in a different impedance compared to feeding at the end.
- This means the input impedance is not independent of the feed-point location.
Conclusion
In summary, option 'A' is correct because the directional radiation characteristics of a dipole antenna show maximum intensity in a direction normal to its axis. Understanding these principles is essential for effective antenna design and application in communication systems.
Dipole antennas are widely used in communication systems. When analyzing their radiation pattern, it's crucial to understand the characteristics that affect their performance.
Maximum Radiation Intensity
- The radiation intensity of a dipole antenna is indeed maximum along the plane perpendicular to its axis.
- This is due to the dipole's radiation pattern, which is doughnut-shaped. The antenna radiates more effectively in directions orthogonal to its length.
Current Distribution
- The current distribution along a dipole antenna is not uniform. In practice, the current varies along the length of the dipole, typically peaking at the center and tapering off toward the ends.
- This non-uniformity is especially pronounced in electrically short dipoles.
Effective Length vs. Physical Length
- The effective length of a dipole can differ from its physical length. Factors such as frequency and the presence of nearby objects can alter the effective length, impacting its impedance and radiation characteristics.
Input Impedance and Feed-point Location
- The input impedance of a dipole antenna varies based on the feed-point location. For example, feeding at the center results in a different impedance compared to feeding at the end.
- This means the input impedance is not independent of the feed-point location.
Conclusion
In summary, option 'A' is correct because the directional radiation characteristics of a dipole antenna show maximum intensity in a direction normal to its axis. Understanding these principles is essential for effective antenna design and application in communication systems.
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For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer?
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For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer?.
For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer? for Defence 2024 is part of Defence preparation. The Question and answers have been prepared according to the Defence exam syllabus. Information about For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Defence 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer?.
Solutions for For a dipole antennaa)The radiation intensity is maximum along the normal to the dipole axisb)The current distribution along its length is uniform irrespective of the lengthc)The effective length equals its physical lengthd)The input impedance is independent of the location of the feed – pointCorrect answer is option 'A'. Can you explain this answer? in English & in Hindi are available as part of our courses for Defence.
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