Ultra-Wideband Diversity MIMO Antenna System for Future Mobile Handsets

Sensors

Haleh Jahanbakhsh Basherlou¹  Yasir I. A. Al-Yasir²  Naser Ojaroudi Parchin²  Ahmed M. Abdulkhaleq²  Raed A. Abd-Alhameed² 

[1] Bradford College, West Yorkshire, Bradford BD7 1AY, UK;Faculty of Engineering and Informatics, University of Bradford, Bradford BD7 1DP, UK;

关键词: double-fed slot antenna;    MIMO system;    mobile terminals;    polarization diversity;    UWB technology;   

DOI  :  10.3390/s20082371

来源: DOAJ

【 摘 要 】

A new ultra-wideband (UWB) multiple-input/multiple-output (MIMO) antenna system is proposed for future smartphones. The structure of the design comprises four identical pairs of compact microstrip-fed slot antennas with polarization diversity function that are placed symmetrically at different edge corners of the smartphone mainboard. Each antenna pair consists of an open-ended circular-ring slot radiator fed by two independently semi-arc-shaped microstrip-feeding lines exhibiting the polarization diversity characteristic. Therefore, in total, the proposed smartphone antenna design contains four horizontally-polarized and four vertically-polarized elements. The characteristics of the single-element dual-polarized UWB antenna and the proposed UWB-MIMO smartphone antenna are examined while using both experimental and simulated results. An impedance bandwidth of 2.5–10.2 GHz with 121% fractional bandwidth (FBW) is achieved for each element. However, for S₁₁ ≤ −6 dB, this value is more than 130% (2.2–11 GHz). The proposed UWB-MIMO smartphone antenna system offers good isolation, dual-polarized function, full radiation coverage, and sufficient efficiency. Besides, the calculated diversity performances of the design in terms of the envelope correlation coefficient (ECC) and total active reflection coefficient (TARC) are very low over the entire operating band.

【 授权许可】

Unknown