Design and Measurement-Based Evaluation of Multi-Antenna Mobile Terminals for Lte 3500 MHZ Band

Abstract

Abstract-Design of multi-element antennas (MA) for small mobile terminals operating at higher frequencies remains challenging despite smaller antenna dimension and possibility of achieving electrically large separation between them. In this paper, the importance of the type of radiating elements operating at 3400-3600 MHz and their locations on the terminal chassis is highlighted. An isotropic radiation pattern that receives incoming signals from arbitrary directions is obtained by combining the radiation patterns of multiple antennas with localized chassis current distribution. Four MA configurations with two-and eight-element antennas are designed and evaluated experimentally in indoor propagation environments. Our proposed designs of MAs provide the highest MIMO channel capacity compared to their counterparts using antennas with less localized chassis current distribution, even in the presence of user's hand.

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

“…. The diversity and MIMO performance were shown to degrade due to power absorbed by the hand thus reducing the MEG of the multiantenna system .…”

“…However, the mobile terminals are likely in data transfer scenarios where a user holds the terminal with data and browsing‐mode grips . The typical hand grips are shown in Figures (b) and (c), respectively.…”

“…Therefore, to maximize the probability of having unobstructed antennas to the user's hand, multiple antennas are proposed to be located at the top corner and center of the terminal's major edge . Specifically, three antennas are designed at the minor edges and two antennas are located at the center of major edges.…”