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Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will be
- a)3
- b)5
Correct answer is between '3,5'. Can you explain this answer?
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Verified Answer
Consider a lossless antenna with a directive gain of +6db. If 1mW of ...
Lossless antenna with directive gain of +6dB = 4 (In linear)
View all questions of this test
Input power to antenna = 1 mW
Power radiated by antenna = 4 mW
Thus,
Radiated power = 4 × 1 mW = 4 mW
Hence option (a) is correct.
Most Upvoted Answer
Consider a lossless antenna with a directive gain of +6db. If 1mW of ...
Given Information:
- Lossless antenna
- Directive gain of 6 dB
- Power fed to the antenna is 1 mW
Explanation:
To understand why the correct answer is between 3 and 5, we need to understand what directive gain represents and how it affects the total power radiated by the antenna.
What is Directive Gain?
- Directive gain is a measure of how much an antenna focuses its radiation in a particular direction.
- It is expressed in decibels (dB) and indicates the increase in power density in the desired direction compared to an isotropic radiator (an ideal point source that radiates equally in all directions).
Relation between Directive Gain and Total Power Radiated:
- The directive gain of an antenna does not directly determine the total power radiated by the antenna.
- The total power radiated by an antenna depends on the input power and the efficiency of the antenna.
- The efficiency of an antenna accounts for losses in the antenna system (such as resistive losses in the antenna elements, feedline losses, etc.).
Calculating Efficiency:
- Since the antenna is lossless, it means that there are no losses in the antenna system.
- Therefore, the efficiency of the antenna is 100% or 1.
Calculating Total Power Radiated:
- The total power radiated by an antenna is the product of the input power and the efficiency.
- In this case, the input power is given as 1 mW.
- Since the efficiency is 1 (or 100%), the total power radiated by the antenna is also 1 mW.
Conclusion:
Based on the given information, the total power radiated by the antenna is 1 mW. Therefore, the correct answer is neither 3 nor 5, but 1.
- Lossless antenna
- Directive gain of 6 dB
- Power fed to the antenna is 1 mW
Explanation:
To understand why the correct answer is between 3 and 5, we need to understand what directive gain represents and how it affects the total power radiated by the antenna.
What is Directive Gain?
- Directive gain is a measure of how much an antenna focuses its radiation in a particular direction.
- It is expressed in decibels (dB) and indicates the increase in power density in the desired direction compared to an isotropic radiator (an ideal point source that radiates equally in all directions).
Relation between Directive Gain and Total Power Radiated:
- The directive gain of an antenna does not directly determine the total power radiated by the antenna.
- The total power radiated by an antenna depends on the input power and the efficiency of the antenna.
- The efficiency of an antenna accounts for losses in the antenna system (such as resistive losses in the antenna elements, feedline losses, etc.).
Calculating Efficiency:
- Since the antenna is lossless, it means that there are no losses in the antenna system.
- Therefore, the efficiency of the antenna is 100% or 1.
Calculating Total Power Radiated:
- The total power radiated by an antenna is the product of the input power and the efficiency.
- In this case, the input power is given as 1 mW.
- Since the efficiency is 1 (or 100%), the total power radiated by the antenna is also 1 mW.
Conclusion:
Based on the given information, the total power radiated by the antenna is 1 mW. Therefore, the correct answer is neither 3 nor 5, but 1.
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Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will bea)3b)5Correct answer is between '3,5'. Can you explain this answer?
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Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will bea)3b)5Correct answer is between '3,5'. Can you explain this answer? for GATE 2024 is part of GATE preparation. The Question and answers have been prepared according to the GATE exam syllabus. Information about Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will bea)3b)5Correct answer is between '3,5'. Can you explain this answer? covers all topics & solutions for GATE 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Consider a lossless antenna with a directive gain of +6db. If 1mW of power is fed to it the total power radiated by the antenna will bea)3b)5Correct answer is between '3,5'. Can you explain this answer?.
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