MIMO Antennas with Coupling Manipulation for Low SAR Devices

Mutual coupling between multiple antennas is used in this chapter to lower the amount of specific absorption rate (SAR) when a mobile device is in close proximity to the human body. The recommended antenna works at 4.3 and 2.1 GHz. A periodic version of defective ground structure (DGS) is used in conjunction with capacitors and diodes to change the coupling between antenna components. The functioning of the presented antenna design is confirmed using current distribution and characteristic mode analysis (CMA). The performance of multiple‐input, multiple‐output (MIMO) is investigated using the capacity loss and envelope correlation coefficient (ECC) analysis. Antenna performance is shown to be influenced by the LCD and the hand. When compared with the standard value of the proposed antenna arrangement, the SAR investigation showed a 30% reduction in SAR.