Tissue Equivalent Liquids as per IEEE-1528 for SAR compliance testing

The dielectric properties of human tissues for various body parts have extensively studied over the past decades. These dielectric parameters are frequency dependent, viz. permittivities that decrease and conductivities that increase with frequency. In their standard document, IEEE 1528-2013 (IEEE-1528-2019 published now), IEEE has specified the dielectric properties for different frequencies to be used while experimental SAR evaluation through mobile and wireless devices. Microwave metrology at CSIR-NPL has started the work of preparation of these tissues equivalent liquid. These TEL’s will have equivalent properties (dielectric constant and conductivity both) as specified in IEEE-1528 document for range of 500 MHz 6 GHz range each
(proposed) at measurement temperature 23 ± 1 °C.

TEL’s  are  used  for  phantom models  while  estimating  SAR  values  of  mobile  handheld devices.  This  will  be  commercially useful for industries and testing agencies for SAR estimation and certification.

It is an attempt to indigenous Mobile certification using Human Equivalent liquids at different microwave frequencies.