Table of Contents
- 1 What causes the attenuation present in a waveguide?
- 2 What happens inside a waveguide below its cut off frequency?
- 3 On what factors the cut off frequency of a waveguide depends derive expression in support of your answer?
- 4 What are the different types of attenuation in waveguide?
- 5 Why we Cannot use waveguide at low frequencies?
- 6 What is 3 db cutoff frequency?
- 7 What is minimum attenuation?
- 8 Do you know different frequencies used for different applications at what frequencies waveguide is used why we Cannot use waveguide at low frequencies?
- 9 How is the attenuation of a waveguide demonstrated?
- 10 How does attenuation affect the quality of a signal?
What causes the attenuation present in a waveguide?
Answer: c Explanation: Attenuation of a propagating wave is due to both the irregularities in the waveguide and as the property of the dielectric material. Hence attenuation of a propagating wave is due to both conductor loss and dielectric loss.
What happens inside a waveguide below its cut off frequency?
Waveguides will only carry or propagate signals above a certain frequency, known as the cut-off frequency. Below the waveguide cutoff frequency, it is not able to carry the signals. If the wavelength is too long, then the waveguide will not operate in a mode whereby it can carry the signal.
What does the cut off frequency of a waveguide mean?
The cutoff frequency of an electromagnetic waveguide is the lowest frequency for which a mode will propagate in it. Thus, any exciting frequency lower than the cutoff frequency will attenuate, rather than propagate.
On what factors the cut off frequency of a waveguide depends derive expression in support of your answer?
The cut-off frequency depends on the shape and size of the cross-section of the waveguide. The larger the waveguide, the lower its cut-off frequency. Cut-off frequency of a waveguide with a circular cross-section and radius ‘a’: Upvote.
What are the different types of attenuation in waveguide?
Rectangular waveguides are widely used in high-power applications due to their low loss propagation. The two types of losses in a rectangular waveguide are dielectric losses and conductor (metallic) losses in the walls. Total attenuation is the sum of the attenuation caused by conductor and dielectric losses.
What is the significance of attenuation constant?
A rating for a line or medium through which a plane wave is being transmitted, equal to the relative rate of decrease of an amplitude of a field component, voltage, or current in the direction of propagation, in nepers per unit length.
Why we Cannot use waveguide at low frequencies?
A waveguide is a special form of transmission line consisting of a hollow, metal tube. Waveguides will only carry or propagate signals above a certain frequency, known as the cut – off frequency. Below this the waveguide is not able to carry the signals.
What is 3 db cutoff frequency?
All Answers (65) 3db is the power level, its the frequency at which the power is at 3db below the maximum value and 3db means in normal unit its half the maximum power so 3db frequency means the frequency at which the power is half the maximum value so its decided the cuttoff frequency.
In which condition the attenuation constant is near to zero?
The attenuation constant will be zero or positive, for a conventional transmission line. When α=0 the voltage will not decrease in amplitude as it moves through the cable, and for large α the signal quickly drops to zero as you move away from the source.
What is minimum attenuation?
The minimum attenuation is at Z0=0 ohms.
Do you know different frequencies used for different applications at what frequencies waveguide is used why we Cannot use waveguide at low frequencies?
Wave guides conduct microwave energy at lower loss than coaxial cables. Waveguides are practical only for signals of extremely high frequency, where the wavelength approaches the cross-sectional dimensions of the waveguide. Below such frequencies, waveguides are useless as electrical transmission lines.
Can a waveguide carry a signal below the cutoff frequency?
Below the waveguide cutoff frequency, it is not able to carry the signals. In order to carry signals a waveguide needs to be able to propagate the signals and this is dependent upon the wavelength of the signal.
How is the attenuation of a waveguide demonstrated?
Attenuation in Waveguide. It is demonstrated that strong absorption of a TM wave upon grazing incidence on a metal surface is analogous to total transmission of a TM wave incident on a dielectric surface at the Brewster angle. Vanishing reflectance of the metal surface leads to increasing attenuation of oscillations propagating in a waveguide.
How does attenuation affect the quality of a signal?
Attenuation can happen with any type of cable or wireless connection, including the following: While attenuation is the loss of signal strength, amplification boosts the strength of a signal. However, amplification can also affect the noise in the transmission, potentially degrading the quality of the signal.
How does the absorption of a TM wave lead to attenuation?
It is demonstrated that strong absorption of a TM wave upon grazing incidence on a metal surface is analogous to total transmission of a TM wave incident on a dielectric surface at the Brewster angle. Vanishing reflectance of the metal surface leads to increasing attenuation of oscillations propagating in a waveguide.