Due to the widespread popularity of radio equipment (such as mobile phones) worldwide, more and more government departments, telecommunications regulatory agencies, etc. require electromagnetic wave radiation to be reduced to an appropriate level.
In order to meet the urgent needs of the majority of mobile phone manufacturers, ITC introduced the British SATIMO mobile phone electromagnetic wave energy absorption ratio (SAR) test system. The test system is fully compliant with IEEE/IEC/EN and US ANSI SAR standards. It is fast, accurate, safe and efficient. It is also the most widely used and widely recognized SAR test system in the world's top laboratories. The system has a test frequency range of 6 GHz and can be tested for multi-type products such as GSM, CDMA, WLAN, etc. (not limited to mobile phones).
With the development of information technology and manufacturing industry, the public is paying more and more attention to the impact of electromagnetic radiation of wireless communication terminals on human health while enjoying the various conveniences brought by wireless communication devices;
Governments have always attached great importance to this indicator of wireless communication terminals; Europe, the United States, Australia, New Zealand, Japan, South Korea and Taiwan have formulated relevant directives, technical regulations and mandatory regulations for RF and microwave radiation management in the region or in the country. Sex standard
Many countries, including China, have required mobile user terminal manufacturers to indicate SAR-related technical specifications and user guidelines in product packaging and/or instructions.
Definition of SAR: Under the action of external electromagnetic field, an inductive electromagnetic field will be generated in the human body. Since all kinds of organs in the human body are lossy media, electromagnetic fields in the body will generate electric current, resulting in absorption and dissipation of electromagnetic energy. SAR is commonly used in biodoping to characterize this physical process.
The meaning of SAR is the electromagnetic power absorbed or consumed by human tissue per unit mass, in units of W/kg. It can also be expressed as: the differential value of the energy micro-element (dW) absorbed (dissipated) by the mass micro-element (dm) in the volume micro-element (dV) of a given density (ρ) versus time is SAR, and the following equation represents:
SAR can also be obtained using any of the following formulas:
Where: SAR - specific absorption rate, the unit is W / kg;
E - the Rms value of the electric field strength in the tissue, in units of V/m;
Σ--media conductivity, the unit is S / m;
- the specific heat capacity of the organization, the unit is J / kg and K;
- the starting time derivative of tissue cells in K / s