Meaning
Human head models used in wireless compliance tests provide a standardized, repeatable simulation of radio frequency energy absorption. The plastic shell known as the Specific Anthropomorphic Mannequin defines the physical dimensions and dielectric boundaries of the human head. This model consists of left and right cheek and tilt test positions where the mobile device is positioned during evaluation.
It ensures that different testing laboratories measure identical exposure levels under controlled conditions.
Shell Composition
The material used to manufacture the shell must have a low permittivity and loss tangent to avoid distorting the electromagnetic fields. When employing the Specific Anthropomorphic Mannequin, the outer shell is filled with tissue simulating liquid that matches the electrical properties of human brain tissue. Standardized wall thicknesses of two millimeters are maintained across the cheek and ear regions where the device lies closest to the liquid.
This precision prevents measurement errors from incorrect shell thickness.
Test Positions
Mechanical positioning arms secure the handset against the reference ear and mouth points of the shell. With the Specific Anthropomorphic Mannequin, tests are performed in both cheek and fifteen-degree tilt configurations to replicate realistic phone calls. These positions are defined by reference lines on the shell that align with the handset’s speaker and vertical centerline.
This standardized mounting ensures that the test results accurately reflect typical daily user exposure.
System Calibration
Laboratory compliance requires the head phantom to remain physically stable during the entire measurement sequence. Maintaining the Specific Anthropomorphic Mannequin in a rigid support fixture prevents mechanical deflection from compromising the scan results.
