Title :
A 4×4 MIMO antenna system for mobile tablets
Author :
Shoaib, Sultan ; Shoaib, Imran ; Shoaib, Nosherwan ; Xiaodong Chen ; Parini, Clive G.
Author_Institution :
Dept. of Electron. Eng. & Comput. Sci., Queen Mary Univ. of London, London, UK
Abstract :
This paper presents a 4×4 MIMO antenna system for mobile tablets. Each antenna of the MIMO system is capable of covering GSM 900(890-960MHz), GSM 1800(1710-1880 MHz), GSM 1900(1850-1990 MHz), UMTS (1920-2170 MHz), WLAN (2400-2480 MHz), WiMAX (3400-3600 MHz) and several LTE frequency bands. The MIMO antenna system is composed of four coupled fed monopole antennas which each antenna placed on the corner at the non-grounded portion of the circuit board. The substrate used for the circuit board is FR-4 substrate with relative permittivity of 4.4 and loss tangent of 0.02. The overall volume of the circuit board is 230 × 176 × 0.8 mm3 with each antenna occupying an area of 75 × 11 mm2. To improve the isolation between antennas of the MIMO system a decoupling structure, consisting of ground slots and decoupling strips, was etched on the bottom layer of the circuit board. The isolation achieved is better than 15 dB over all the frequency bands covered by each antenna leading to an envelope correlation coefficient of less than 0.09. The simulation and measured results are in good agreement.
Keywords :
MIMO communication; antenna feeds; correlation methods; monopole antennas; notebook computers; permittivity; 4×4 MIMO antenna system; FR-4 substrate; GSM 1800 bands; GSM 1900 bands; GSM 900 bands; LTE frequency bands; UMTS bands; WLAN bands; WiMAX bands; circuit board; coupled fed monopole antennas; decoupling strips; decoupling structure; envelope correlation coefficient; frequency 1710 MHz to 1880 MHz; frequency 1850 MHz to 1990 MHz; frequency 1920 MHz to 2170 MHz; frequency 2400 MHz to 2480 MHz; frequency 3400 MHz to 3600 MHz; frequency 890 MHz to 960 MHz; ground slots; loss tangent; mobile tablets; relative permittivity; Antenna measurements; Antenna radiation patterns; MIMO; Mobile antennas; Mobile communication; Antenna; Multiple Input Multiple Output (MIMO); decoupling; mobile; printed monopole antenna;
Conference_Titel :
Antennas and Propagation (EuCAP), 2014 8th European Conference on
Conference_Location :
The Hague
DOI :
10.1109/EuCAP.2014.6902411
