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A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.
  • a)
    49
  • b)
    47.33
  • c)
    50.33
  • d)
    50
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
A hollow rectangular waveguide has dimensions a = 2b. Calculate the am...
Since, wave is attenuated hence β = 0
and Take, dominant mode m = 1,
n = 0
.
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Most Upvoted Answer
A hollow rectangular waveguide has dimensions a = 2b. Calculate the am...
To calculate the amount of attenuation in a hollow rectangular waveguide, we need to use the formula for attenuation in waveguides:

Attenuation = α × length

where α is the attenuation constant and length is the length of the waveguide.

The attenuation constant α can be calculated using the following formula:

α = (2πf√(με)) / β

where f is the frequency, μ is the permeability of free space, ε is the permittivity of free space, and β is the propagation constant.

The propagation constant β can be expressed as:

β = √(k^2 - (π/a)^2 - (π/b)^2)

where k is the wave number, given by:

k = ω√(με)

Given that a = 2b, we can substitute a = 2b into the formulas above to simplify the calculations.

Now, let's substitute the given values into the formulas:

a = 2b
b = 1 cm = 0.01 m
f = 3 GHz = 3 × 10^9 Hz
μ = 4π × 10^-7 Tm/A
ε = 8.854 × 10^-12 F/m

First, we need to calculate k:

k = ω√(με)
= 2πf√(με)
= 2π(3 × 10^9 Hz)√(4π × 10^-7 Tm/A)(8.854 × 10^-12 F/m)
≈ 2.674 × 10^7 rad/m

Next, we can calculate β:

β = √(k^2 - (π/a)^2 - (π/b)^2)
= √((2.674 × 10^7 rad/m)^2 - (π/(2b))^2 - (π/b)^2)
≈ 2.674 × 10^7 rad/m

Finally, we can calculate the attenuation constant α:

α = (2πf√(με)) / β
= (2π(3 × 10^9 Hz)√(4π × 10^-7 Tm/A)(8.854 × 10^-12 F/m)) / (2.674 × 10^7 rad/m)
≈ 47.33 Np/m

Therefore, the amount of attenuation is approximately 47.33 Np/m. Thus, the correct answer is option B.
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A hollow rectangular waveguide has dimensions a = 2b. Calculate the amount of attenuation, if the frequency is 3 GHz, and b = 1 cm.a)49b)47.33c)50.33d)50Correct answer is option 'B'. Can you explain this answer?
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