System and method for mitigation of an electromagnetic field (emf) at an information handling system using a metasurface

A method of mitigating an electromagnetic field (EMF) at a metasurface unit cell array formed on an information handling system, comprising:

• receiving electromagnetic (EM) waves of an incident radiofrequency signal at a metasurface unit cell array operatively coupled to a chassis surface of the information handling system, where the metasurface unit cell array includes a plurality of metasurface unit cells and each metasurface unit cell including a passive set of concentric antennas to receive the incident radiofrequency signal;
• capturing the incident radiofrequency signal from the concentric antennas via a microwave circuit coupled to the set of concentric antennas and a passive coupler, wherein the microwave circuit is configured to and perform phase modulation of the captured, incident radiofrequency signal with a tunable delay circuit controlled by a metasurface controller;
• executing computer-readable program code instructions, via a hardware processor of the information handling system, of an adaptive mitigation system module to determine when the radiofrequency signal is meets a sufficient radiofrequency signal communication threshold selected from a signal strength indicator (RSSI) threshold level from an RSSI sensor, a signal-to-interference-plus-noise ratio (SINR) threshold level from an SINR sensor, or a wireless bandwidth requirement level at the information handling system to trigger electromagnetic field (EMF) mitigation with the metasurface unit cell array;
• sending a bias voltage, via the metasurface controller, to a tunable delay circuit to phase shift the captured, incident radiofrequency signal to generate a reflected radiofrequency signal at a first metasurface unit cell to create interference patterns in the incoming incident radiofrequency signal to create a null region within the EM waves of the incident radiofrequency signal on one side of the information handling system;
• and
• sending the bias voltage to the tunable delay circuit to phase shift the captured, incident radiofrequency signal to generate a reflected radiofrequency signal at a second metasurface unit cell for interference patterns in the incoming EM waves of the incident radiofrequency signal to create directional EM wave radiofrequency transmission or reception lobes within the EM waves of the incident radiofrequency signal on a second side of the information handling system.

An information handling system comprising:

• a hardware processor, a memory device, and a power management unit (PMU) to provide power to the hardware processor and memory device;
• a metasurface unit cell array operatively coupled to a chassis surface of the information handling system to manipulate electromagnetic (EM) waves of an incident radiofrequency signal, the metasurface unit cell array including a plurality of metasurface unit cells each metasurface unit cell including a passive set of concentric antennas to receive the incident radiofrequency signal;
• a microwave circuit coupled to the set of concentric antennas via a passive coupler, wherein the microwave circuit is configured to capture the incident radiofrequency signal from the concentric antennas and perform phase modulation of the captured, incident radiofrequency signal with a tunable delay circuit controlled by a metasurface controller;
• the hardware processor to execute computer-readable program code instructions of an adaptive mitigation system module to determine when the radiofrequency signal is meets a sufficient radiofrequency signal communication threshold selected from a signal strength indicator (RSSI) threshold level from an RSSI sensor, a signal-to-interference-plus-noise ratio (SINR) threshold level from an SINR sensor, or a wireless bandwidth requirement level at the information handling system to trigger electromagnetic field (EMF) mitigation with the metasurface unit cell array;
• the metasurface controller to send a bias voltage to a tunable delay circuit to phase shift the captured, incident radiofrequency signal to generate a reflected radiofrequency signal at a first metasurface unit cell to create interference patterns in the incoming incident radiofrequency signal to create a null region within the EM waves of the incident radiofrequency signal on one side of the information handling system;
• and
• the metasurface controller to send the bias voltage to an attenuator circuit to adjust the amplitude of the reflected radiofrequency signal at the first metasurface unit cell to adjust a level of destructive interference to the incident radiofrequency signal within the null region created by phase adjustment operation of the tunable delay circuit.