Abstract
In this article, a two element mutiple-input multiple-output (MIMO) antenna is designed to operate in 4.98 GHz to 6.04 GHz. The antenna has inter-element edge to edge spacing of 0.4 mm (≈0.013λg/0.00664 λ0, where λg and λ0 are the guided and free space wavelength respectively at the lowest resonant frequency 4.98 GHz) which is extremely smaller than Rayleigh resolution distance. In spite of this, an acceptable port isolation is achieved by employing a stub in the common ground. Each radiating element comprises of etched rectangular patch having largest dimension ≈0.6 λg fed with 50 Ω microstrip line. The proposed MIMO has overall size of 40 × 26 × 1.67 (≈1.34 λg × 0.87 λg × 0.056 λg) mm3. Furthermore, the diversity parameters such as envelope correlation coefficient, diversity gain and mean effective gain have been studied in non-uniform medium. The total active reflection coefficient (TARC) and loss in channel capacity are found to be remain within the acceptable limit to exhibit the desired performances. The proposed antenna can be applied in 5G (below 6 GHz), WLAN and Wi-Fi bands.
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