Abstract
This paper presents a novel decoupling technique between two closely spaced MIMO antennas whose edge-to-edge spacing is 0.03 λ (1.975 mm) where λ is the wavelength in the dielectric medium. The closely spaced MIMO antennas have a major disadvantage of high mutual coupling (MC) which affects its entire characteristics; thereby degrading the antenna performance. To overcome this problem, a microstrip resonator structure is introduced in between the antennas that act as a decoupled device. The microstrip resonator acts as an electrical wall between the MIMO antennas. The antenna parameters are simulated using IE3D EM simulator and a suppression of 48 dB MC is achieved at the resonant frequency of 4.85 GHz. The MIMO antennas have been fabricated and the results are compared with the simulated ones. The antenna finds its suitability in applications in fields of wireless communication, WLAN and satellite communication systems.
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