A Dual-Band Wearable Exposure Meter for Personal RF Exposure Assessment in Indoor Environments: On-body Calibration in a Reverberation Chamber

For the first time, a dual band wearable personal distributed exposure meter (DPDE) is designed. The DPDE is calibrated on-body in a reverberation chamber. The meter consists of four nodes including textile antennas operating at 2443 MHz (WiFi 2 GHz) and 2595 MHz (LTE 2600 MHz). The location of the nodes are optimized based on the calibration in a reverberation chamber. The results show that the DPDE has a high antenna-body isolation and thus its performance is less affected by presence of the human body. The measurement uncertainty of the designed DPDE is maximum 4.5 dB in terms of 68% confidence interval of its response. The results are validated in a real office environment for WiFi 2 GHz. The DPDE has a detection limit of
$3\ \mu W.m^{-2}$
in diffuse fields.