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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.
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SAR Test
Standards |
The TDK RF
Solutions SAR test system covers European,
Asian, and North American standards that deal
with SAR testing:
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Test |
Title |
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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 |
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FCC 96-326 |
Guidelines for Evaluating the
Environmental Effects of RF Radiation |
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ANSI/IEEE C95.1-1999 |
IEEE Standard for Safety
Levels with Respect to Human Exposure to RF
Electromagnetic Fields 3 kHz to 300 GHz |
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ETSI TR 134 925 |
Universal Mobile
Telecommunication System (UMTS); SAR
requirements and regulations in different
regions |
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IEEE Std-1528-200X(Draft) |
Recommended Practices for
Determining the Spatial-Peak SAR in the Human
Body Due to Wireless Communication Devices:
Experimental Techniques |
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prEN 50361:200 (Draft) |
Human Exposure to
Electromagnetic Fields High-Frequency 300 MHz to
3 GHz |
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ES59005 |
Considerations for the
Evaluation of human exposure to Electromagnetic
Fields from Mobile Telecommunication Equipment
in the Frequency Range 30 MHz to 6 GHz. |
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