iSAR is a family of immediate SAR measurement systems, capable of analyzing the RF performance of a wireless device in under 1 second. iSAR Head, iSAR Flat and iSAR Quad are optimized for testing of prototypes, final design and production units.
|Note||iSAR has been replaced by cSAR3D as of Nov 2014, except under existing arrangements. Attractive discounts for upgrade to cSAR3D are available.|
||iSAR Flat measures the equivalent area scan tests for body-worn devices as required by IEC 62209-2. A total of 256 sensors simultaneously measure the SAR of a wireless device. The sensors are conformal to the top surface and embedded in an absorbing material simulating head or body tissue. iSAR performs fast (< 1 second) and repeatable (< 0.1 dB) measurements.|
||iSAR Head closely simulates the area scan tests for devices operated at the ear as required by IEC62209-1, IEEE 1528, FCC OET65, etc. The shape of the iSAR Head corresponds to the ear-mouth line of the SAM head. A total of 256 sensors simultaneously measure the SAR of a wireless device. The sensors are conformal to the top surface and embedded in an absorbing material simulating head tissue. iSAR performs fast (< 1 second) and repeatable (< 0.1 dB) measurements.|
iSAR Quad is the largest and highest-resolution iSAR available. iSAR Quad is capable of scanning a large planar area (562 mm x 386 mm), making it well suited for scanning laptops, tablet computers and other large devices. It is also capable of 1 - 2 mm resolution scan resolution, using novel algorithms. The sensors are conformal to the top surface and embedded in an absorbing material simulating head or body tissue.
In single scan operation, iSAR Quad performs a measurement typically in less than one second using a 15 mm scan resolution in the same way as iSAR Flat operation.
In full scan operation, the 256-element sensor array is moved under the device, over a large scanning area. Movement is continuous and the SAR distribution is constructed with a fine resolution. The total scanning time is one to two minutes, depending on the scan area and measurement resolution.
Production line testing - iSAR² provides quality assurance, enabling fast and reliable testing of factory production samples prior to sale. Our software includes automatic data logging for statistical evaluation. Fast detection of compliance with safety limits or deviation of RF performance from a reference phone can be performed.
Large device testing - The large surface area of the iSAR Quad makes it ideal for testing laptops, pads, WLAN routers and other devices. The full area can be measured in one scan.
Comparator - Visualize production or prototype variations.
Operating systems supported: Windows 7
|Measurement Time||Flat, Head: < 1 s
Quad: 1 - 2 min for full scan, resolution dependent; < 1 sec for single scan
|Frequency Range||0.5 – 3 GHz (max. 0.5 – 6 GHz)|
|Active Measurement Area||Flat, Head: 120 x 240 mm
Quad: 562 x 386 mm
|Total Absorbing Material||320 x 320 x 80 mm|
Broadband Head Simulating Medium
Conformance with target dielectric parameters: < 10% across frequency range (graph)
|Number of Active Sensors||256|
|Measurement Grid Resolution||Flat, Head: 15 mm
Quad: < 2 mm
|Total Weight, without cables or accessories||30.5 kg (Head)
33.5 kg (Flat)
250 kg (Quad)
|Sensitivity||< 0.05 W/kg (0.5 - 5 GHz)
< 0.15 W/kg (5 - 6 GHz)
|Dynamic Range||CW: 100 W/kg|
|Repeatability||< 0.1 dB (with combiner)|
|Shell Thickness||Flat, Head: 2 mm
Quad: 2.9 mm
|Measurement Cycles||> 3 million measurements|
|Additional Accessories||Masks for iSAR Head
Golden Validation Device
|Calibration||Calibration is performed to SPEAG's high-quality standards. iSAR calibration is included within the scope of our ISO/IEC 17025 accreditation.|
|Comparison with DASY6||
A comparison of iSAR and DASY measurement results has been conducted for a limited set of mobile telephones.
iSAR is not a substitute for DASY6. DASY6 is fully compatible with international SAR measurement standards and is used for full compliance evaluation of wireless devices. iSAR Head has the following limitations compared to DASY6:
Fixed 15 mm measurement grid resolution (DASY6 has an adjustable grid resolution). If the SAR distribution has a 3 dB width less than the grid resolution, the SAR results may strongly depend on the device positioning (e.g., standard deviation of at least 10% for a 3 dB width less than 10 mm). This variation can be reduced using the Combiner feature. The iSAR Quad has a much finer grid resolution and is more suitable for measuring SAR distributions with high spatial gradients.
2D sensors (DASY6 has 3D sensors). iSAR measures the two electric field polarizations parallel to the phantom surface. The absence of the polarization in the depth direction may cause SAR underestimation if the source has strong electric fields perpendicular to the phantom surface and the source is located in close proximity to the iSAR surface. Using low-loss spacers between the device and the iSAR can reduce this effect.
Sensor length. iSAR has been designed for frequencies up to 3 GHz, and it has proven to be suited for QA evaluations up to 6 GHz. We do not recommended to use it for absolute assessments above 3 GHz. At these frequencies, the sensors do not meet the requirement for short length with respect to the wavelength in the medium, resulting in degraded isotropy. cSAR3D has been designed for offering absolute accuracy for frequencies at least up to 6 GHz.
2D area scan (DASY6 performs volumetric measurements). iSAR estimates the volumetric SAR distribution from measurements conformal to the iSAR surface, using advanced algorithms. The uncertainty of this estimation is documented in a publication by Kanda et al.
Transfer calibration. DASY6 probes are calibrated using a primary source (e.g., waveguide) with low calibration uncertainty, while iSAR probes are calibrated in situ with RF sources that are traceable to DASY measurements, resulting in higher calibration uncertainty. iSAR and DASY calibration uncertainties are reported on our calibration page.
iSAR is ideal for applications where relative measurements are needed. Further information is available in a conference presentation.