Abstract
The scattering of electromagnetic plane waves by an interface, located between perfect electromagnetic conductor and absorbing half-planes is investigated. The perfect electromagnetic conductor half-plane is divided into perfect electric conductor and perfect magnetic conductor half-screens. The same decomposition is done for the absorbing surface. Then four separate geometries are defined according to this approach. The scattered fields by the four sub-problems are obtained with the aid of the modified theory of physical optics. The resultant scattering integrals are combined in a single expression by using key formulas, defined for the perfect electromagnetic conductor and absorbing surfaces. The scattering integral is asymptotically evaluated for large values of the wave-number and the diffracted and geometric optics fields are obtained. The behaviors of the derived field expressions are analyzed numerically.
Highlights
THE method of physical optics (PO) is widely used in electromagnetics for scattering analysis [1, 2], wave propagation in waveguides [3], antennas [4] and radar applications [5, 6]
We proposed a method, named as the modified theory of physical optics (MTPO), that was leading to the exact edge diffracted fields for the perfect electric conductor (PEC) and perfect magnetic conductor (PMC) half-planes in 2004 [8]
With the aid of this concept, we proposed a new method, which is named as the method of transition boundary (MTB)
Summary
THE method of physical optics (PO) is widely used in electromagnetics for scattering analysis [1, 2], wave propagation in waveguides [3], antennas [4] and radar applications [5, 6]. The angle between the diffracted wave and incident GO field are not same according to this normal vector For this reason, the current should be evaluated with respect to a variable unit vector instead of the static one. We proposed a method, named as the modified theory of physical optics (MTPO), that was leading to the exact edge diffracted fields for the perfect electric conductor (PEC) and perfect magnetic conductor (PMC) half-planes in 2004 [8]. With the aid of this concept, we proposed a new method, which is named as the method of transition boundary (MTB) It was proposed for the evaluation of the diffracted waves for two dimensional problems [11]. A time factor of exp(jwt) is assumed and suppressed throughout the paper. w is the angular frequency
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