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Lesson 5: Antennas - Transmission and Reception

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Lesson 5: Antennas - Transmission and Reception

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Questions and Answers

Which of the following statements about free-space propagation is NOT true?

There are no obstacles between the transmitter and receiver.

The signal is transmitted through a medium.

Diffraction and scattering do not occur in free-space propagation. (correct)

Reflections occur when the surface is larger than the wavelength of the signal.

What is the primary factor that contributes to attenuation distortion in unguided media transmission?

Refraction

Free space loss

The higher the frequency of the signal, the higher the attenuation distortion (correct)

Multipath interference

Which of the following techniques can be used to mitigate attenuation distortion?

Using a higher frequency signal

Increasing the distance between the transmitter and receiver

Increasing the transmission power without boosters

Using equalizers (correct)

What is the primary factor that determines free space loss in wireless transmission?

The distance between the transmitter and receiver Signup and view all the answers

What is the relationship between the path loss exponent and frequency in wireless transmission?

As frequency increases, the path loss exponent increases. Signup and view all the answers

What is the primary function of an antenna?

To transmit and receive electromagnetic signals Signup and view all the answers

What is the purpose of a radiation pattern in antenna design?

To graphically represent the radiation properties of the antenna Signup and view all the answers

What is the purpose of sidelobes in a radiation pattern?

To represent areas of extra energy radiation outside the mainlobe Signup and view all the answers

Which type of antenna radiates power equally in all directions?

Isotropic antenna Signup and view all the answers

What is the primary advantage of using a parabolic reflective antenna?

It provides high directivity for focused signal transmission Signup and view all the answers

What is the relationship between antenna gain and effective area?

Antenna gain is directly proportional to effective area Signup and view all the answers

What is the purpose of the spectrum in antenna design?

To control the total range of frequencies that can be transmitted Signup and view all the answers

Which propagation mode is suitable for transmitting signals above 30 MHz?

Line of sight propagation Signup and view all the answers

What is the primary difference between the radio horizon and the optical horizon?

The radio horizon is further than the optical horizon Signup and view all the answers

Which of the following is not one of the five basic propagation mechanisms mentioned in the text?

Ionospheric propagation Signup and view all the answers