Dual-Element Antenna System for Hexa-band Smartphone MIMO Applications

A new low-profile dual-element antenna is proposed for hexa-band Smartphone MIMO applications. It consists of two antenna structures in which, each one excite orthogonal characteristic mode to achieve isolation very easily below 1 GHz. Both elements (the metal frame antennas and the internal PILA antenna) are is analyzed and optimized in terms of the reflection coefficient and the current distribution. The final design (dual-element) is made and tested in terms of S-parameters, envelope correlation coefficient, mean effective gain and the diversity gain. The results show that this design is a good candidate for hexaband MIMO applications and in particularly suitable for such as GSM850/DCS1800/PCS1900/UMTS2100/LTE2500/LTE3600 mobile applications.