Effect of Slot Structure in Isolation of a Closely-spaced PIFA MIMO Antenna Design for Future 5G Applications

This paper presents a study on a rectangular slot structure at the ground plane of a PIFA MIMO antenna. The two-element PIFA MIMO have been designed on full copper plate material with a thickness of Tc = 0.45mm. The performance of the proposed antenna in terms of the reflection coefficient, isolation, envelope correlation coefficient (ECC) radiation pattern and gain are observed and analysed using CST Microwave Studio Software. The proposed antenna is fabricated and measured to validate the simulation results. A very good agreement of the reflection coefficient is demonstrated between simulated and measured results at 15 GHz. The measured gain 6 dB is slightly lower than the simulated 9 dB. However, the proposed slot antenna shows a better isolation with -32 dB at the resonant frequency. Thus, this offers useful for study and can be applied for future 5G wireless applications.