A compact multiple-input-multiple-output (MIMO) antenna with very high isolation is proposed for ultrawide-band (UWB) applications. The antenna with a compact size of 30.1x20.5 mm^2 (0.31λ0 x0.21λ0 ) consists of two planar-monopole antenna elements. It is found that isolation of more than 25 dB can be achieved between two parallel monopole antenna elements. For the low-frequency isolation, an efficient technique of bending the feed-line and applying a new protruded ground is introduced. To increase isolation, a design based on suppressing surface wave, near-field, and far-field coupling is applied. The simulation and measurement results of the proposed antenna with the good agreement are presented and show a bandwidth with S 11 < -10 dB, S 12 < -25 dB ranged from 3.1 to 10.6 GHz making the proposed antenna a good candidate for UWB MIMO systems.
Cite
@article{arxiv.1707.05122,
title = {High Isolation Improvement in a Compact UWB MIMO Antenna},
author = {Hossein Babashah and Hamid Reza Hassani and Sajad Mohammad-Ali-Nezhad},
journal= {arXiv preprint arXiv:1707.05122},
year = {2017}
}