SkyCross has developed a way to reduce Specific Absorption Rate (SAR)
levels in small wireless devices without sacrificing signal strength.
Prior to this latest SkyCross innovation, reducing transmitted power
was a means to reduce SAR for regulatory compliance, but the signal
strength could drop to a level that network operators would not accept.
Incorporating iMAT technology from SkyCross in small wireless devices
enables them to operate using half the power without any change in
signal strength while reducing SAR levels and increasing battery life.
SAR measures the rate that the body absorbs radio-frequency (RF) energy
when exposed to an electromagnetic field. Various governments around
the world regulate SAR levels for wireless devices including handsets,
USB dongles, and laptops as a safety precaution. Signal-to-noise ratio
(SNR) compares the strength of a desired signal to the level of
background noise. Engineers widely understand that reducing power
nominally by 50 percent also reduces the SAR by 50 percent, but this
would also mean that SNR was cut in half.
iMAT (Isolated Mode Antenna Technology) is a design technique that
enables a single antenna element to behave like multiple antennas. By
using iMAT in a small device such as a USB dongle, where it is
particularly challenging to support multiple antennas, iMAT enables
transmit beam forming so SNR is not affected when the output power is
This SAR breakthrough is the latest in a series of iMAT developments.
Since iMAT was launched last year, it has been incorporated in many
small wireless devices, successfully replacing many antennas
traditionally required for diversity or MIMO. The technology simplifies
integration, saves space, and reduces bill of material (BOM) costs.
iMAT has also consolidated the number of antennas required in
smartphones and enabled a game-changing handset architecture that
lowers the cost of ownership by eliminating the switchplexer.