Efficient Computation of Electromagnetic Coupling From Various Types of Antennas Based on Reciprocity Theorem

In the design of complex electronic systems, such as electric vehicles, electromagnetic coupling between a specific component and an antenna should be quantitatively estimated according to the radiated emission (RE) and radiated immunity (RI) standards. However, full-wave electromagnetic simulations of complex systems and antennas in a large space take much time and effort. The decomposition method based on reciprocity and Huygens's principle, which enables the separate analysis of source and victim parts, has been previously proposed for efficient analysis of coupling to a lumped port of the victim antenna. In this article, the decomposition method along with the extraction of an S-parameter block is extended to handle the dominant transverse electric mode in a waveguide antenna. The proposed method removes the difficulty and uncertainty in the modeling process of a commercial waveguide antenna. Also, while applying the decomposition method, Huygens's principle is additionally applied to further reduce the full-wave simulation time of a large empty space. The proposed methods are validated with full-wave electromagnetic simulations, and also experimentally applied to RI estimation. The proposed time-efficient techniques can realize the full-wave computation of RE and RI for real complicated systems and commercial antennas.