Electromagnetic field coupling between cellular phones using FDTD analysis

The assessment of potential hazards caused by electromagnetic interference to electronic systems as well as transmission devices is an essential engineering task. The effect of nearby electrically active objects on the effective radiation characteristics of the phone is yet to be investigated. Examples of this situation include the presence of a similar radiating object nearby the cellular phone, the presence of reflecting objects, resonance conditions between different structures and frequency shift effects. In this paper, a detailed characterization of the effects of EM coupling on the performance of cellular phones placed in close proximity to each other is presented. The analysis is performed numerically using the FDTD method and is focused on the modification of the input impedance and radiation properties of the phone.