Multijurisdictional Co Location SAR Evaluation Limits for Portable Host Devices
Multijurisdictional co-location SAR evaluation requires host-level total exposure ratio analysis and spatial decoupling to ensure global market clearance.
Tissue-Equivalent Media
Meaning
Artificial materials provide a consistent and predictable substitute for human flesh during laboratory safety tests. These tissue-equivalent media are used to fill phantoms or create solid models that represent the head or muscle of a user. Using standardized materials ensures that testing results can be compared between different laboratories around the world.
The composition is adjusted for specific frequency bands to maintain the correct electrical conductivity and permittivity throughout the measurement process.
Physical Stability
Solid versions of these materials do not leak or evaporate over time making them easier to handle for certain types of testing. The tissue-equivalent media must maintain their shape and dielectric properties over a range of environmental conditions. Regular inspections are necessary to check for cracking or degradation that could affect the accuracy of the measurements.
Electromagnetic Response
Conductivity and permittivity are carefully controlled during the manufacturing process to match the target anatomy. The tissue-equivalent media absorb energy in a way that replicates the interaction between radio waves and human cells. This allows for a safe and non-invasive way to measure the potential heating effects of wireless devices.
Material Validation
Each batch of material must be tested to confirm it meets the specifications set by international standards. Documentation for the tissue-equivalent media includes the frequency range for which the material is valid and its expected lifespan. Accurate material properties are a requirement for any valid specific absorption rate report.