This design enhances gain for WLAN and 5G with dual-band operation, indicating significant innovation.
This work proposes the development of a metamaterial-loaded circularly dual-band cavity-backed substrate integrated waveguide (SIW) MIMO antenna designed for the sub-6 GHz, emphasizing sub-6 GHz 5G and WLAN applications. The creation of dual operating bands is enabled via a modified dual split ring resonator (CSRR)-shaped slot that is etched into the SIW cavity-backed rectangular radiator. Additionally, the antenna incorporates 6x3 modified SSRR unit cells strategically located in front of the intended radiators along the y-axis. This arrangement enables circular polarization and enhances the gain of the proposed radiator at 3.3 GHz and 5 GHz. The metamaterial loading of the proposed antenna yields a gain of 5.5 dB at 2.4 GHz and 5.4 dB at 5 GHz. Further, the implementation of a CSRR electromagnetic bandgap (EBG) decoupling structure reduces the mutual coupling between the radiators. The antenna exhibits an exceptional diversity performance. The experimental validation of the system confirms its intended functionality.
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S et al. (2025) studied this question.
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