Miniaturized MIMO Antenna with Low Inter-radiator Transmittance and Band Rejection Features

In this article, compact a multiple-input and multiple-output (MIMO) system with flag-shaped radiators and a mountain-shaped ground plane is presented. Isolation is enhanced with the help of a decoupling stub placed between radiators, where two bands are stopped with the help of slits etched into the radiators. The overall size of the proposed antenna is 15 mm x 25 mm x 1.6 mm. The reflection coefficients are less than-10 dB between 3-10.9 GHz, except the bands WiMAX (3.2-3.7 GHz) and WLAN (5-6 GHz); similarly, measured and simulated transmission coefficients are less than-20 dB across the entire band of UWB. The envelope correlation coefficient (ECC) is less than 0.02 and the diversity gain is greater than 9.9 dB. The gain, ECC, radiation pattern, multiplexing efficiency, diversity gain and various other parameters are discussed and evaluated in detail.