Design and Analysis of Highly Efficient Microwave Absorber for 5G Applications

This study presents the design of a highly efficient microwave absorber on an FR-4 substrate measuring 48x66x1.5 mm³. Design and simulation were conducted using CST STUDIO, with several parametric studies aimed at achieving increased absorption within the desired frequency band. Alterations to the geometric shape constituted the stages of absorber refinement, with simulation values analyzed to assess absorber efficiency at each stage. Throughout the four analysis steps, the absorption was obtained at three different frequency values covering the n77 and n78 5G bands, with the highest absorption observed at 3.8 GHz. In conclusion, in the final geometric configuration, electromagnetic wave absorption percentages were determined as 97.3%, 98.04%, and 97.8% at frequencies of 3.7 GHz, 3.8 GHz, and 3.9 GHz, respectively.