Plane Wave Excitation for Frequency Domain Electromagnetic Problems by Means of Impedance Boundary Condition

The paper presents how a plane wave excitation could be modeled in the context of the Discrete Geometric Approach (DGA) by means of an impedance boundary condition, a capability that DGA was lacking. A methodology for the construction of an equivalent model of an anechoic wall is then presented as an application of the developed theory. The advantages of the resulting model are twofold: taking into account all the geometric details of the anechoic material requires more computational resources. Moreover, when an entire anechoic chamber is to be modeled, it is easier to deal with a flat wall rather than one covered with cones and ferrite tiles. The proposed equivalent model allows for a great simplification, while maintaining a good degree of accuracy.