Eight-element antenna array for diversity and mimo mobile terminal in LTE 3500 MHz band

A multiantenna system comprising of an eight-element antenna array in mobile terminal is presented. In this work, two sets of eight-element antenna structures based on capacitive coupling element and inverted-F antennas operating at 3400–3600 MHz long-term evolution frequency band are designed. The structures are estimated to achieve a good effective diversity gain in both uniform and nonuniform environments. It is also shown that the proposed structures achieve an ergodic multiple-input multiple-output (MIMO) capacity of only 1.2 bit/(s Hz) lower than the capacity achieved by ideal uncorrelated antennas. A prototype is fabricated to validate the simulation results. The result shows that the structure exhibited the highest mutual coupling of −10 dB across the required frequency band. Therefore, the proposed structure is a good candidate for implementing diversity and MIMO in mobile terminals. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1323–1327, 2014