iSAR HEAD
Immediate SAR Scanner for SAM Evaluation
Description |
Download Product Flyer (PDF, 800 kB) 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. |
| Applications | 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. Prototype testing - iSAR² allows you to instantly evaluate prototype designs on the bench. With iSAR², it is easy to evaluate the effect of small design modifications on RF performance, such as changes to antenna design, shielding or board components. |
| Software Features | Comparator - Visualize production or prototype variations. Timesweep - See device performance over time to detect device stability. Combiner - Enhance measurement resolution with one-click combining. Automated control - GPIB control of the CMU200 for easy device control. Flexible scripting - Control equipment and data analysis with IronPython. |
| Measurement Time | < 1 s |
| Frequency Range | 0.5 – 3 GHz (max. 0.3 – 6 GHz) |
| Active Measurement Area | 120 x 240 mm |
| Total Absorbing Material | 320 x 320 x 80 mm |
| Dielectric Medium |
Broadband Head Simulating Medium Conformance with target dieletric parameters: < 10% across frequency range (graph) |
| Number of Active Sensors | 256 |
| Measurement Grid Resolution | 15 mm |
| Total Weight, without cables or accessories | 30.5 kg |
| Sensitivity | < 0.05 W/kg |
| Dynamic Range | CW: 100 W/kg |
| Repeatability | < 0.1 dB (with combiner) |
| Shell Thickness | 2 mm |
| Measurement Cycles | > 3 million measurements |
| Additional Accessories | Masks for iSAR Head CRANE for iSAR² Golden Validation Device |
| Conformity | ISO 12100 |
| 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 DASY5 |
A comparison of iSAR and DASY measurement results has been conducted for a limited set of mobile telephones. iSAR is not a substitute for DASY5. DASY5 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 DASY5: Fixed 15 mm measurement grid resolution (DASY5 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. 2D sensors (DASY5 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. 2D area scan (DASY5 performs volumetric measurements). iSAR estimates the volumetric SAR distribution from measurements conformal to the iSAR surface, using advance algorithms. The uncertainty of this estimation is documented in a publication by Kanda et al. Transfer calibration. DASY5 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. |
