Analysis of SAR mitigation implementing millimeter wave antenna with FSS-based absorber for 5 G application

In this article, an FSS-based absorber has been developed and utilized to mitigate the specific absorption rate of a millimeter-wave antenna loaded with an inter-digital capacitor (IDC) for 5 G applications. SAR mitigation of millimeter-wave antennas is one of the aspects to be considered for next-generation applications. The addition of a triple-band absorber operating at 28, 60, and 73 GHz reduces the SAR value by blocking radiation on the antenna's backside. This approach lowered the value of the SAR by 75 % and more through the targeted operating bands, diminished significantly the SAR distribution, and increased the antenna gain. In accordance with the Federal Communications Commission and International Commission on Non-Ionizing Radiation Protection (ICNIRP) regulations, a decrease in SAR values signify a decrement in radiation absorption by human tissue, thereby lowering the likelihood of health risks from electromagnetic radiation. Rogers RT-Duroid 5880 serves as the antenna's substrate, while epoxy resin fiber (FR-4) is used for the absorber. The investigation's findings in the constructed antenna sample with the incorporated absorber demonstrate that the modeled and observed results correspond well, demonstrating the viability and effectiveness of the unique design in SAR mitigation in millimeter wave bands.