DANSK DS/IEC/TR 62630 PDF

This Technical Report addresses exposure evaluation techniques for the overall exposure level caused by the simultaneous exposure to multiple narrowband EM sources. Throughout the Report, it is assumed that the exposure evaluation occurs under static conditions, i.e., the source position and transmit-mode characteristics (e.g. emitted power, modulation scheme, etc.) of the device(s) under test do not vary significantly over the time required to carry out the evaluation using the chosen evaluation technique (e.g., field measurements). The vast majority of wireless communication systems world wide employ signalling schemes featuring narrowband waveforms, hereinafter defined as signal waveforms occupying a frequency band not broader than 10% of its central frequency (justification of this threshold is provided later). Annex A presents the operating bands and signal bandwidths of several common wireless access schemes. Wide-band communication systems, e.g., Ultra Wide-Band (UWB) systems employing impulsive waveforms with fractional bandwidth well in excess of 10%, are relatively new to the marketplace, have experienced limited deployment so far, and are not typically regarded as significant contributors to EM exposure levels. NOTE Present exposure evaluation standards for fixed or mobile wireless communication devices, e.g., IEC 62209-1, are mostly tailored towards defining suitable techniques for narrowband waveforms. For instance, they recommend the use of scalar E-field or H-field sensors, e.g., diode-detector miniature probes, which typically provide accurate readings for narrowband waveforms, as defined herein. The paucity of wide-band wireless communication systems, which have only very recently been introduced in the marketplace, as well as the low power levels associated to the corresponding signals to avoid interfering coexisting electronic systems, has so far lowered the priority to standardize suitable evaluation techniques and to develop the relative test instrumentation.