The secondary radiation effects of IBDN grounding system

When electrical or electronic devices work, they unavoidably, unintentionally and unconsciously radiate electromagnetic waves and energy. The unintentional electromagnetic radiation results in many problems, such as electromagnetic interference, imposing limitations, information security problems, harmful effects to the human body, and other social problems. The integrated building distribution network (IBDN), or commercial building network, becomes the information center, the economic center, and the political center. The grounding system works as an antenna in high frequency and digital states. The locally confined induced currents produce secondary radiation effects. Though it cannot increase the radiation, it can rearrange the pattern of the radiation and the radiation may be very strong in some direction, especially for some resonance frequency. A model for the secondary radiation effects of an IBDN grounding system is given. Then, the formulae for calculating the radiated electric fields from the line current element and the rectangular current element are given.