Antenna Height Effect on Radiation Angle
The angle of radiation from an antenna is the angle above the horizontal at which the radio waves are transmitted into space.
Key Relationship:
- Increasing the height of an antenna generally leads to a decrease in the angle of radiation.
- Conversely, decreasing the antenna height tends to increase the angle of radiation.
Reasoning:
A lower angle of radiation is desirable for long-distance communication (skywave propagation) because it allows the radio waves to travel further before hitting the ionosphere and reflecting back to Earth. Higher antennas achieve these lower angles more effectively.
Therefore, if the height of an antenna increases, the angle of radiation naturally decreases.
Important Questions from Basics of Antenna
Arrange the following antennas in ascending order of their radiation resistance.
A. Short dipole (L = \(\frac{\lambda}{10}\) )(I av = l o)
B. Short dipole (L= \(\frac{\lambda}{10}\) )( I av = l o/2)
C. Linear \(\frac{\lambda}{2}\) dipole (sinusoidal current distribution)
D. Small Loop (square loop) single turn of(L = \(\frac{\lambda}{10}\) )
Choose the correct answer from the options given below
If the frequency of the signal is 1 MHz, the minimum height of the transmitting antenna should be:
The Antenna employed in Television receivers
Which of the following is NOT true with respect to antennas?
An instrument to check whether RF power in the transmission line is transferred to the antenna is:
