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Introduction to SAR Testing

The full English name of SAR is Specific Absorption Rate, which is generally referred to as the electromagnetic wave absorption ratio or specific absorption rate in Chinese. The electromagnetic wave energy absorption ratio of mobile phones or wireless products is defined as the induced electromagnetic field generated in the human body under the action of an external electromagnetic field. Due to the fact that various organs in the human body are consumable media, the electromagnetic field inside the body will generate current, leading to the absorption and dissipation of electromagnetic energy. SAR is commonly used in biological dosimetry to characterize this physical process. The meaning of SAR is the electromagnetic power absorbed or consumed per unit mass of human tissue, measured in W/kg.

SAR testing classification by product type

2G mobile phone, 3G mobile phone, 4G mobile phone, 5G mobile phone, walkie talkie, tablet computer, laptop computer USB WiFi、 High power Bluetooth earphones, etc.

Classified by frequency distribution:

GSM 450、GSM 850、GSM 900、GSM 1800、GSM 1900； UMTS Band1, L Ⅱ Il、V、V、VIll； CDMA、EVDO800、850、1700、1900； PPT Device (136MHz SAR testing standard in various countries 174MHz), (400MHz to 520MHz), Walkie Talkie; Bluetooth（V2.1+EDR、V3.0、V3.0+HS、V4.0）； WiFiIEEE 802.11 a/b/g/n）。

Classified by authentication type:

CE-RED, FCCID, IC, Thailand, India, KC, NCC, MIC, etc.

Summary:

SAR testing mainly targets products with wireless transmission within 20cm of the human body, and the power of the product exceeds the power values exempted by various countries.

SAR testing standards of various countries