Diversity performance of band notched ultra-wideband MIMO antenna

Abstract

Like other wireless networks, UWB systems suffer from multipath fading. By fully using the abundant scattering circumstances and enhancing the shared connection between multi-antenna components, MIMO technique was known to improve the enormous data rate transmission and bandwidth limitation. A compact multiple-input-multiple-output (MIMO) antenna is proposed which has high seclusion and band-reject qualities for ultra-wideband (UWB) applications. It comprises two monopole micro-strip elliptical patch radiating elements. The fabricated MIMO antenna having a dimension of 18 × 36×1.6 mm3. To enhance isolation between two monopole antennas, a T- molded stub is extruded in the ground plane. To achieve band indented function for Wireless LAN (4.92–6.1 GHz), a dumbbell (I) molded stub is extruded. The Proposed antenna possesses a high seclusion of < −18 dB over the entire operating band frequency (2.9–18 GHz). The simulation results and structure analysis are studied on the basis of improved-isolation between two ports, radiation patterns, current distribution on surface, realized gain is more than 2.8 dBi, Correlation Coefficient of Envelope (ECC) is less than 0.1, Total Active Reflection Coefficient (TARC) is less than − 10 dB, Mean Effective Gain (MEG) is less than − 3 dB, Channel Capacity Loss (CCL) is less than 0.29 bps/Hz and Diversity Gain is less than 9.95 dB which shows high diversity performance. For this design, except at the notch-band range, the Voltage-standing-wave-ratio (VSWR) is less than 2.