The energy absorbed by the hand/wrist from a RF device is an important issue as it can affect the radiation pattern and cause considerable degradation to the performance of a wireless device.
IndexSAR have produced hand phantoms for many years, they have been in close collaboration with a number of major handset manufacturers to develop a standard ‘Classic’ hand grip The IXB-060/090 phantom hand shape was carefully considered to be configured into the most common setting a real hand may adopt when holding a handset. It has also been sized to allow most standard ‘Block’ handsets to be ‘grasped’.
The hands are produce from silicone, loaded with carbon powder as the predominant lossy material to give the required dielectric properties over the wide frequency range of 600MHz to 2.8GHz.
For positional repeatability the hands are reasonably ‘stiff’, allowing some flexibility to cater for most ‘Block’ DUT’s.
The IndexSAR ‘classic’ hands are produced in x 2 sizes; IXB-060 (original worst case size) and IXB-090, that is,10% less by dimension than the IXB-060. The IXB-090 is similar in size and form to that described in the current CTIA test plan.
Positioning accuracy and repeatability are of key importance, and with the unique air spacer/ platform, repeatability +/- 0.1dB has been achieved in OTA tests.