A Compact Two-element UWB Wearable MIMO Antenna with Reduced Mutual Coupling for Body Worn Applications
Raju Pandey, Ashim Kumar Biswas, Ujjal Chakraborty
Abstract
A two-element compact wearable Multiple Input Multiple Output antenna for ultra-wideband (UWB) applications is proposed in this work. The designed antenna comprises a triangular slot in the ground plane, and four innovative slotted square-shaped isolators connected in series are positioned between antennas on the jeans substrate's top surface to diminish the antenna coupling. The proposed antenna structure offers the frequency spectrum from 2.42–11.94 GHz with 132.59% fractional bandwidth and ensures isolation excess of 26 dB in the UWB frequency range (3.1-10.6 GHz). The antenna exhibits good diversity performance inside the UWB range, such as a low envelope correlation coefficient (<0.13), high diversity gain (>9.91 dB), minor channel capacity loss (<0.31 Bits/Sec/Hz), a tiny magnitude variation between the mean effective gain of two ports (|MEG1-MEG2|<0.12 dB) and stable total active reflection coefficient response respectively. Across the functioning band, it also delivers radiation efficiency exceeding 87% and satisfactory time domain performance. The SAR value found below the specified limit (<1.6 W/kg) implies that the design is acceptable for wearable applications. The developed antenna configuration occupies a volume of 32 × 52 × 1.5 mm3. The simulated and measured findings are observed in well-matched conditions.