Page 115 - IJEEE-2023-Vol19-ISSUE-1

Received: 14 October 2022 Revised: 24 November 2022 Accepted: 05 December 2022
DOI: 10.37917/ijeee.19.1.14
Vol. 19| Issue 1| June 2023

Ð Open Access

Iraqi Journal for Electrical and Electronic Engineering

Original Article

New Design of a Compact 1×2 Super UWB-MIMO
Antenna for Polarization Diversity

Watheq A. Neamah *1,2, Haider M. Al Sabbagh1, Hussain Al-Rizzo3
1 Department of Electrical Engineering, College of Engineering, University of Basrah, Basrah, Iraq

2 Biomedical Engineering Department, College of Engineering, University of Thi-Qar
3 Department of Systems Engineering, University of Arkansas University Little Rock, Little Rock, USA

Correspondence
*Watheq Abdulkareem Neamah
Department of Electrical Engineering,
University of Basrah, Basrah, Iraq
Email: watheq.neamah@utq.edu.iq

Abstract
This paper proposes a new design of compact coplanar waveguide (CPW) fed -super ultra-wideband (S-UWB) MIMO antenna
with a bandwidth of 3.6 to 40 GHz. The proposed antenna is composed of two orthogonal sector-shape monopoles (SSM)
antenna elements to perform polarization diversity. In addition, a matched L-shaped common ground element is attached for
more efficient coupling. The FR-4 substrate of the structure with a size of 23 × 45 × 1.6 mm3 and a dielectric constant of 4.3 is
considered. The proposed design is simulated by using CST Microwave Studio commercial software. The simulation shows that
the antenna has low mutual coupling (|S21| < -20 dB) with |S11|<-10 dB, ranging from 3.6 to 40 GHz. Envelope correlation
coefficient (ECC) is less than 0.008, diversity gain (DG) is more than 9.99, mean effective gain (MEG) is below - 3 dB and total
active reflection coefficient (TARC) is less than -6 dB over the whole response band is reported. The proposed MIMO antenna
is expected efficiently cover the broadest range of frequencies for contemporary communications applications.
KEYWORDS: Two Ports, MIMO, Super UWB, High Isolation, ECC, TARC.

I. INTRODUCTION microwave and other applications, not restricted to new
mobile technologies [7].
In recent years, antenna designs for not only ultra-wideband
(UWB) applications (3.10 GHz-10.6 GHz), but also Super Practical UWB antenna design challenges include broad
UWB (S-UWB) antennas with bandwidth ratios more than impedance matching, radiation stability, a low profile, and a
10 to 1 have emerged as solutions for multiple applications, cheap cost [8]. There are two major challenges in designing
resulting in a new approach in wireless technologies such as MIMO antennas for UWB systems. One major challenge for
microwave imaging, cognitive radio, sensing networks, MIMO systems is to reduce antenna elements' size. The
higher data rate wireless communications, X-band Radar, other is to make the antenna elements more isolated from
and K-band Satellite [1], [2]. The demand for high data rates each other [9]. It is important to note that UWB wideband
and good channel capacity has always been the top impedance matching should be unaffected by the methods
consideration in modern wireless communication systems. employed to decrease mutual coupling.
Wireless communication systems depend on ultra-wideband
UWB and multi-input-multi-output (MIMO) technologies Within the last several years, many proposals for S-UWB
for high-speed data streaming [3]. Multipath fading is one of antennas have emerged [10]–[13]. In [10], a CPW-fed
the main problems that degrade the performance of UWB slotted circular monopole achieves a bandwidth of
systems, and it can be overcome using MIMO technology (11.66-56.1) GHz. To achieve a frequency range of 3.32 to
[4]. MIMO systems can use diversity to improve 20 GHz, a monopole structure made of circular corrugations
communication device reliability without requiring on a defective ground is reported [11]. A bow-tie-shaped
additional transmitted power or bandwidth by mitigating the vertical patch with two asymmetrical ground planes to get
vulnerable multipath fading issue [5]. MIMO antennas have bandwidth (3.035–17.39) GHz is proposed [12] . The
received much attention recently as critical devices in UWB suggested structure in [13] is a triangular patch fed by
MIMO systems. Those UWB antennas are also successfully a CPW to achieve a bandwidth of 4.9-25 GHz.
used in the Internet of Things (IoT) [6], the radar sector, the
Because of their ubiquitous usage in modern
applications, S-UWB MIMO antennas have garnered much
attention in recent years. Many studies have been conducted

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and

reproduction in any medium, provided the original work is properly cited.

© 2023 The Authors. Published by Iraqi Journal for Electrical and Electronic Engineering by College of Engineering, University of Basrah.

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