Frequency Selective Surface Based Triple Band Multi Slotted MIMO antenna for Sub-6 GHz Wireless Applications

The growing need to have high data rate and reliable wireless communication systems has accelerated the development of compact multiband antennas with better radiation performance. A multiband slotted Multiple-Input Multiple-Output (MIMO) antenna based on Frequency Selective Surface (FSS) has been presented in this work to be used in the modern wireless communication. The proposed antenna operates at 3.4 GHz, 6.68 GHz, and 8.4 GHz and encompasses significant frequency bands of sub-6 GHz 5G, C-band wireless systems, and X-band communication solutions. Multiband operation is accomplished through introducing well-designed slots in the radiating patch which adjust the surface current distribution and produce a variety of resonant paths. The MIMO antenna design is used to increase the channel capacity, diversity functionality, and link reliability with maintaining a compact design. In addition to this, a periodic FSS layer is added to the antenna structure to boost the gain of the antenna in the range from 12–14 dBi, radiation efficiency and to also avoid undesired surface waves. Complex simulations and parametric analyses are conducted to test the performance of the antenna in terms of reflection coefficient, radiation patterns, gain and MIMO diversity parameters including envelope correlation coefficient (ECC) and diversity gain. The proposed antenna exhibits good impedance matching, and better antenna elements isolation, and at the target frequencies, the antenna shows enhanced radiation properties. The achieved findings suggest the suggested multiband FSS-accompanied MIMO antenna to be one of the potential candidates of the next-generation multiband wireless communication systems.