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
The antenna which provides circularly polarized waves is
A dipole carries RMS current of about 300 A across the radiation resistance 2 Ω. What would be the power radiated by an antenna?
A Yagi antenna is a directional antenna consisting of parasitic elements-
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:
