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SAR Test Systems

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TDK RF Solutions


The TDK RF Solutions Specific absorption rate (SAR) Measurement System is designed to measure electromagnetic fields and calculated SAR over a customer-specified frequency range. All tests are conducted in a shielded test room.

Since ultra compact and interference-free electric-field probes allow vector measurement inside biological media, KAPTEOS solution meets specific absorption rate measurement needs for public exposure to electromagnetic fields, especially inside phantoms.  


TDK SAR - Specific Absorption Rate Test Systems


TDK Logo




3 kHz - 6 GHz


TDK Specific Absorption Rate Test System (SAR-TS)




  • Robot with probe

  • Twin phantom and integrated table

  • Validation instrumentation in mini-rack

  • Dipole antenna

  • EUT mounting device

  • Shield Room - Anechoic Absorber

  • Turnkey Solution

TDK Specific Absorption Rate Test System (SAR-TS)

Specific Absorption Rate Test Systems


The TDK SAR System

The TDK RF Solutions Specific absorption rate (SAR) Measurement System is designed to measure electromagnetic fields and calculated SAR over a customer-specified frequency range. All tests are conducted in a shielded test room.


SAR Measurements

SAR testing deals with the thermal effects of human exposure to RF electromagnetic fields. The SAR is a value that corresponds to the relative amount of RF energy absorbed by the user of a device in close proximity to the body. The purpose of testing is to verify that the RF energy emitted by a device is within permissible limits for public exposure as defined by test standards.


System Components

The TDK SAR Measurement System is comprised of the following subsystems:


Measurement System

The measurement system is an easy to use, flexible package optimized for dosimetric evaluation of radio products. The package includes Data Acquisition Electronics and system control computer.


Probes and Measurement Accessories 

Several types of broadband probes and support accessories are offered based on test requirements. These can include probes to measure fields inside fluids simulating body tissue to test radiated emissions from mobile radio equipment, and probes to measure current distribution on radio products in free space.


Position Controller and Positioning Robot 

The automated robot positions the probe inside the tissue-simulating liquid over a precisely defined volume. The robot is controlled by a multiprocessor positioning device.


SAR Accessories 

A twin phantom Specific Anthropomorphic Mannequin houses the tissue-simulating fluid and is adapted in shape and size to represent the flattened ear of a mobile phone user. It enables the evaluation of left and right hand phone usage. Additional accessories are provided to implement an effective SAR system.


System Verification and Support 

The validation system enables test engineers to perform a battery of tests to verify the system operates within its specifications to ensure the accuracy of the complete measurement system, components, and software.


System Controller with Application Software 

The SAR system is controlled by a high-end computer; system software consists of robot control, field measurements with variable output selections, field scans for SAR applications, visualization, predefined compliance testing for 1g and 10g SAR measurements, system validation, and various acquisition modes.



SAR Test Standards

The TDK RF Solutions SAR test system covers European, Asian, and North American standards that deal with SAR testing:



ENV 50166-2

Human Exposure to Electromagnetic Fields 10 kHz to 300 GHz

FCC OET Bulletin 65
(Ed. 97-01) Supplement C

Federal Communication Commission Office of Engineering & Technology; Evaluating Compliance with FCC Guidelines for Human Exposure to RF Electromagnetic Fields

FCC 96-326

Guidelines for Evaluating the Environmental Effects of RF Radiation

ANSI/IEEE C95.1-1999

IEEE Standard for Safety Levels with Respect to Human Exposure to RF Electromagnetic Fields 3 kHz to 300 GHz

ETSI TR 134 925

Universal Mobile Telecommunication System (UMTS); SAR requirements and regulations in different regions

IEEE Std-1528-200X(Draft)

Recommended Practices for Determining the Spatial-Peak SAR in the Human Body Due to Wireless Communication Devices: Experimental Techniques

prEN 50361:200 (Draft)

Human Exposure to Electromagnetic Fields High-Frequency 300 MHz to 3 GHz


Considerations for the Evaluation of human exposure to Electromagnetic Fields from Mobile Telecommunication Equipment in the Frequency Range 30 MHz to 6 GHz.





The Specific Absorption Rate (SAR) assessment measures the exposition of electric fields on people. These measurements are based on standards and must be performed inside a phantom (this is a new European directive). The Kapteos eoProbe can be used in any liquids and complies with this new directive.

Example of specific projects:

 Measuring infantrymen exposure to electric fields from military communication antennas

 Application Note: Specific Absorption Rate Assessment


The exposition of people to electromagnetic fields is an historical concern. Electromagnetic fields are generated by a wide variety of systems and the emitted electrical fields have a broad frequency range (from kHz to GHz). The object of a Specific Absorption Rate Assessment is to perform measurements in accordance with standards requiring in-situ electric field in a biological medium.


KAPTEOS_SAS_E-fields in bilogical environment Specific Absorption Rate SAR assessment with phantom


An example would be the SAR of a mobile phone, with the measurements expressed in W/kg (lower is better).


Existing technical E-field measurement solutions

There are 2 different technologies available on the market today:

 To measure the elevation of temperature inside the phantom in various places

 To measure the electric field based on antenna probes inside the phantom in various places


Proposed solution by Kapteos

The Kapteos eoProbe and eoSense electro-optic solution offers the best possible measurement system due to:

 A non-perturbative measurement (no metal parts in the eoProbe)
 A very compact design (5 mm * 35 mm)
 A very small spatial resolution (< 1 mm)
 An ultra-wide band frequency
 An operating temperature from 0 to +50°C for the probe
 The vector measurement of the E- field with excellent rejection ratio of an axis of the field to another (> 50 dB). The measured information is very comprehensive and accurate.


Targeted markets

Any manufacturer producing systems that emit electrical fields due to the transport ion of data or energy:



 Mobile phones


 Communication protocols (Wifi, Bluetooth, RFID…)

 Wireless energy charging systems

 Induction furnaces

 Transport of energy


Customer advantages of using Kapteos solution

 One system that perfectly meets the standards for frequencies from 100kHz to 40GHz

 It allows the measurement of a field vector (amplitude, phase, spectrum, vector direction)


Kapteos references

 Several publications with the XLIM research institute (France)

 Tübingen Clinic (Germany).

 Infantrymen exposure to electric fields from military communication antennas (France).


  Last Updated: May 9, 2021
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