Reconfigurable MIMO Antenna Design with High Isolation using Metasurface

In this paper, a frequency reconfigurable multiple-input-multiple-output (MIMO) antenna has been described. The idea of the design is to form reconfigurable MIMO antenna by the development of two-port antenna that are identical to each other and pin diodes are used to achieve the frequency reconfigurability. The design of the canonical element consists of compact folded slots with one pin diode placed on both the elements for the frequency reconfigurability and the field cancelation to improve isolation can be done by placing a coupling metasurface. In addition, the mutual coupling between the elements is reduced by properly designing the two-port antenna and the coupling metasurface. Based on the PIN diode switching state, the antenna is capable of operating at two different frequency ranges and in both combinations the mutual couplings between ports exhibit better than -10 dB isolation. The canonical element size is 30x15 mm radiates at 2.6 GHz and 3.5 GHz. The antenna performance is obtained in terms of impedance bandwidth and mutual coupling.