UNIT 5
Ground Wave Propagation
Figure 5.1. Plane Earth Reflection
Key takeaways:
Figure 5.2. Space Wave Propagation
Space wave propagation depends on three components:
Dm = (2RHt)-½ + (2RHr)-½
Where,
Dm: the distance between the two antennas
R: radius of the earth
Ht: height of transmission antenna
Hr: height of receiver antenna
5.2.1. Applications
It is used in various communication systems like
5.2.2. Limitations
Key takeaways:
5.3.1. Rayleigh waves
Figure 5.3.1. Rayleigh waves
Key takeaways:
5.4.1. Introduction
5.4.2. Principle used in space wave propagation
Figure 5.4.2. The principle used in space wave propagation
5.4.3. Field strength
dd =
d
dr =
d
Figure 5.4.3. The geometry of space wave propagation
-
=

5.4.4. Effect of curvature of the earth
5.4.5. Effect of Imperfection of earth
5.4.6. Limitations of space wave Propagation
Key takeaways:
References