Electromagnetic Waves in Three Media Which Contain a Linearly Varying Isotropic Medium

Radiation fields from a vertical electric dipole antenna are obtained when the regions I and II are arbitrary homogeneous media and when region III is a plane isotropic ionosphere whose the electron density varies linearly with height and the collision frequency is constant throughout the layer. The point of observation is far away from the source point. So, if the integral solution is expanded in the infinite series and only the first term of the series is used, the integral solution can be shown by radiations from flour image sources. Moreover, as the argument of Airy function; is large, the propagation mechanism becomes clear by using the asymptotic expansion. In the case that one (I) of the three regions is sea water another (II) the atmosphere, and the other (III) the ionosphere, the characteristics of the field intensity versus distance is numerically calculated.