Pulsed EM Field Radiation, Mutual Coupling, and Reciprocity of Thin Planar Antennas

The reciprocity theorem of the time-convolution type is used to construct a purely time-domain methodology that makes possible to readily evaluate the pulsed electromagnetic field radiation characteristics of arbitrarily shaped thin planar antennas and their time-domain mutual coupling. The developed computational model provides an insightful description of thin planar antennas that reveals the principal aspects of their pulsed-radiation behavior. The derived self-reciprocity (time-derivative) relation provides a useful means for determining planar antenna´s radiation characteristics from its response on a plane wave in the receiving state. Moreover, it is demonstrated that this relation may find its applications in consistency checks of general-purpose computational tools. The proposed coupling model indicates the huge savings of computational resources with respect to the traditional approaches such as the finite difference time-domain technique. It is shown that all the obtained results agree well with the (full-wave) finite integration technique.