||With the quantum leap on new technologies, wireless communication was widely adopted in the market place by the general public. But, by looking into our living environment and by receiving all kind of message from the media, we found that the electromagnetic field was radiated all around us. Although, this brought us with the benefit of highly mobility.
But, on the other hand, whether this electromagnetic field would cause any hazardous to the mankind was quite questionable and highly being discussed. And, the health and safety of the general public on this subject would deeply rely upon the mechanisms and/or regulations being enforced by the authorities or managing departments of each individual government. Currently, there were quite a few standards, directives and technical documents being published and brought into implementation by some highly developed countries or area. This includes:
North America (FCC):
- OET 65 Supplement C;
- ANSI/IEEE C95.1;
- IEEE Std-1528.
European Union (CENELEC):
- prEN 50360;
- prEN 50361;
- ES 59005.
At the meantime, Taiwan, with such a well developed infrastructure on wireless communication, had also recognized the situation and set up a regulation by limiting the ratio of RF exposure (Specific Absorption Ratio, SAR) to 1.6 W/Kg.
By referring to all the applicable standards and its defined measuring methods as mentioned above, the following questions are being raised.
- With different measuring methods being adopted, whether the measuring conditions and certain key factors would influent the measured results?
- What is the rationale in setting up the limit of the SAR and its applicability?
The main objective of this research was based upon the applicable measurement standards and requirements, which had been widely adopted, on SAR evaluation in exploring the RF absorption mechanism of human body/head and replying to above two questions. The research had covered the following conditions and scenario:
- Energy absorption mechanism in near field;
- Classification of electromagnetic field exposure on personnel safety;
- Chemical content and ingredients of tissue-simulant liquid on various frequency bands;
The experiments and its related results were conducted under the different approaches with the following key factors being defined:
- Tissue-simulant liquids;
- Frequency bands;
- RF probes/sensors;
- Postures of surface contacts on phantom head with RF devices.