Device and method for rf exposure assessment at millimeter wave frequencies

A method for determining power density distribution of electromagnetic (EM) transmissions across an exposure plane of an antenna of a wireless electronic device, the method comprising:

• determining, by a controller, one or more worst case configurations within an exposure plane based on a power density distribution of the antenna in free space;
• measuring, with a measuring device having a measurement error, power density distribution in amplitude and phase in two polarizations across a first plane at a first distance from the exposure plane and across a second plane at a second distance from the exposure plane, the first plane and the second plane being parallel to the exposure plane;
• first back transforming, by the controller, power density distribution of the first plane to the second plane for the one or more worst case configurations,
• second back transforming, by the controller, power density distribution from the first plane to the exposure plane for the one or more worst case configurations, and
• third back transforming, by the controller, power density distribution from the second plane to the exposure plane for the one or more worst case configurations.

A device for determining power density distribution of electromagnetic (EM) transmissions across an exposure plane of an antenna of a wireless electronic device, the device comprising:

• a measuring device operable to measure power density distribution of the antenna in amplitude and phase in two polarizations across a first plane at a first distance from the exposure plane and across a second plane at a second distance from the exposure plane, the first plane and the second plane being parallel to the exposure plane;
• and
• a controller operable to
• determine one or more worst case configurations within the exposure plane of the antenna based on a power density distribution of the antenna in free space;
• first back transforming power density distribution of the first plane to the second plane for the one or more worst case configurations,
• second back transforming power density distribution from the first plane to the exposure plane for the one or more worst case configurations, and
• third back transforming power density distribution from the second plane to the exposure plane for the one or more worst case configurations.

A non-transitory computer-readable medium for determining power density distribution of electromagnetic (EM) transmissions across an exposure plane of an antenna of a wireless electronic device, the medium comprising instructions that when executed by one or more processors cause a computer to:

• determine one or more worst case configurations within an exposure plane based on a power density distribution of the antenna in free space;
• measure power density distribution in amplitude and phase in two polarizations across a first plane at a first distance from the exposure plane and across a second plane at a second distance from the exposure plane, the first plane and the second plane being parallel to the exposure plane;
• back transform power density distribution of the first plane to the second plane for the one or more worst case configurations,
• back transform power density distribution from the first plane to the exposure plane for the one or more worst case configurations, and
• back transform power density distribution from the second plane to the exposure plane for the one or more worst case configurations.