Electronics and Communication Engineering (ECE) Exam > Electronics and Communication Engineering (ECE) Questions > The radiation resistance of an antenna is 63&...
Start Learning for Free
The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity is
- a)48.26 dB
- b)12.5 dB
- c)38.96 dB
- d)24.7 dB
Correct answer is option 'B'. Can you explain this answer?
| FREE This question is part of | Download PDF Attempt this Test |
Verified Answer
The radiation resistance of an antenna is 63Ω and loss resistance...
Most Upvoted Answer
The radiation resistance of an antenna is 63Ω and loss resistance...
Given information:
Radiation resistance (Rr) = 63
Loss resistance (Rl) = 7
Power gain (G) = 16
Calculating directivity:
Directivity (D) is a measure of how well an antenna focuses radiation in a particular direction. It is given by the formula:
D = 4π * (Rr / (Rr + Rl)) * G
Calculating the value of Rr / (Rr + Rl):
Rr / (Rr + Rl) is a ratio that determines the efficiency of the antenna. A higher value indicates a more efficient antenna.
Rr / (Rr + Rl) = 63 / (63 + 7) = 63 / 70 = 0.9
Substituting the value of Rr / (Rr + Rl) and G in the formula:
D = 4π * 0.9 * 16
Calculating the value of 4π * 0.9:
4π * 0.9 = 4 * 3.14159 * 0.9 = 11.30973
Substituting the value of 4π * 0.9 and G in the formula:
D = 11.30973 * 16 = 181.75568
Converting the result to dB:
Directivity in dB is given by the formula:
Directivity (dB) = 10 * log10(D)
Directivity (dB) = 10 * log10(181.75568) = 10 * 2.2593 = 22.593
Answer:
The directivity of the antenna is 22.593 dB. However, none of the given options match this value. Therefore, the correct answer may not be option 'B' as mentioned.
Radiation resistance (Rr) = 63
Loss resistance (Rl) = 7
Power gain (G) = 16
Calculating directivity:
Directivity (D) is a measure of how well an antenna focuses radiation in a particular direction. It is given by the formula:
D = 4π * (Rr / (Rr + Rl)) * G
Calculating the value of Rr / (Rr + Rl):
Rr / (Rr + Rl) is a ratio that determines the efficiency of the antenna. A higher value indicates a more efficient antenna.
Rr / (Rr + Rl) = 63 / (63 + 7) = 63 / 70 = 0.9
Substituting the value of Rr / (Rr + Rl) and G in the formula:
D = 4π * 0.9 * 16
Calculating the value of 4π * 0.9:
4π * 0.9 = 4 * 3.14159 * 0.9 = 11.30973
Substituting the value of 4π * 0.9 and G in the formula:
D = 11.30973 * 16 = 181.75568
Converting the result to dB:
Directivity in dB is given by the formula:
Directivity (dB) = 10 * log10(D)
Directivity (dB) = 10 * log10(181.75568) = 10 * 2.2593 = 22.593
Answer:
The directivity of the antenna is 22.593 dB. However, none of the given options match this value. Therefore, the correct answer may not be option 'B' as mentioned.
Attention Electronics and Communication Engineering (ECE) Students!
To make sure you are not studying endlessly, EduRev has designed Electronics and Communication Engineering (ECE) study material, with Structured Courses, Videos, & Test Series. Plus get personalized analysis, doubt solving and improvement plans to achieve a great score in Electronics and Communication Engineering (ECE).
|
Explore Courses for Electronics and Communication Engineering (ECE) exam
|
|
Similar Electronics and Communication Engineering (ECE) Doubts
Top Courses for Electronics and Communication Engineering (ECE)View all
The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer?
Question Description
The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer?.
The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer?.
Solutions for The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Electronics and Communication Engineering (ECE).
Download more important topics, notes, lectures and mock test series for Electronics and Communication Engineering (ECE) Exam by signing up for free.
Here you can find the meaning of The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of
The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer?, a detailed solution for The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? has been provided alongside types of The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice The radiation resistance of an antenna is 63Ω and loss resistance 7Ω If antenna has power gain of 16, then directivity isa)48.26 dBb)12.5 dBc)38.96 dBd)24.7 dBCorrect answer is option 'B'. Can you explain this answer? tests, examples and also practice Electronics and Communication Engineering (ECE) tests.
|
|
Explore Courses for Electronics and Communication Engineering (ECE) exam
|
|
Suggested Free Tests
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
x
![]()
For Your Perfect Score in Electronics and Communication Engineering (ECE)
The Best you need at One Place
|
© EduRev
|
Education Revolution
|
Follow Us
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup