Librem 5 SAR (or DAS)


Emanations then, picky, picky, picky.


I agree that radiation exposure should be minimal at the first place and @Caliga already covered basic advantages of Librem 5 when referring to “possibly sufficient space on the PCB to have good antennas”. One of good antennas solutions is usage of Metamaterial-Embedded Low SAR PIFA for Cellular Phone, covered with this statement: “The achieved SAR reduction by metamaterial is 42.12% and by Materials 47.18%,which provide information to design metameterial based antenna for minimize biological effect on human body due to EM radiation.” On radiation exposure of popular mobile phones specifically, professor Gert Frølund Pedersen presents in this study some measurements of total radiated power (TRP) … that includes free space (FS), Fig. 1(d) because “for most of the bands the introduction of a human hand increases the spread among the phones and it is around 5 dB”, etc. Qualcomm® 5G modem-to-antenna solutions are complex as well but head SAR and body SAR are just barely under 1.6 W/kg. We all expect good SAR values from Librem 5 and I am sure that those will be known with batch Evergreen (if not earlier).