Study on multi-radiation source equivalence and prediction

Electromagnetic radiation characteristics within an electronic system are closely related to the characteristics of multi-radiation source (equipments) and their spatial layout. In this paper, two methods are proposed for multi-radiation prediction and equivalence. One is according to the theory of spherical wave expansion and the spatial layout of the equipments, the other is the spherical equivalent dipole array method (SEDAM) proposed by the authors, which is based on the theoretical relationship between three components of magnetic fields and magnetic dipole moments in the spherical coordinate system. The feasibility of the spherical wave spectrum method is verified by a simple dipole antenna model, but the accuracy of the method is not very high for complex models. On the other hand, the SEDAM has high equivalent accuracy for complex models, such as the MIMO Ring antenna. By comparing the results of the far-field magnetic (electric) field and far-field direction pattern with simulation software, the equivalent error of two MIMO Ring equivalent model is within 2.3 dB. Finally, the feasibility of the SEDAM is verified by the actual measurement of the system with two intercoms. The results show that the SEDAM is more accurate under the same measurement conditions.