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Wideband MIMO antenna withenhanced isolation forwireless communicationapplication
Xinyu Liu1, Muhammad Amin2, and Jiajun Liang3a)1 Central Laboratory for Biomedical Engineering, Shenzhen University,
Shenzhen 518000, Guangdong, China2 School of Physics, University of Electronic Science and Technology of China,
China3 College of Information Engineering, Shenzhen University,
Abstract: A wideband multiple input multiple output (MIMO) antenna
with enhanced isolation for wireless communication application is presented
in this article. The proposed antenna operates in a wide frequency range of
1.92–6.1GHz, and is suitable for WiMAX, IEEE 802.11a/b/n/g, UMTS,
LTE-2300 and LTE-2500 wireless communications. The MIMO antenna
structure of the proposed antenna consists of two identical radiators with a
small size of 35 × 36mm2 and a novel H-shaped parasitic element, which
is connected to the ground plane of the proposed antenna. The H-shaped
parasitic element helps in enhancing antenna isolation performance between
the two antenna ports. The overall performance of the proposed antenna in
terms of S-parameters, radiation pattern, gain, and envelope correlation
coefficient is investigated and verified through the measurements. The
measured results show that the proposed antenna has attractive properties
such as compact size, the low mutual coupling of less than −15.4 dB, anda low envelope correlation coefficient of less than 0.14 across the whole
operating frequency band. These attractive properties make the proposed
antenna a good candidate for wireless communication application.
Keywords: MIMO, wideband, high isolation
Classification: Microwave and millimeter-wave devices, circuits, and
modules
References
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1 Introduction
Multiple-input-multiple-output (MIMO) as a wireless technology, can increase the
channel capacity effectively. MIMO technology has become an essential technique
in most wireless standards such as wireless local area network (WLAN), and
worldwide interoperability for microwave access (WiMAX) [1, 2, 3, 4, 5]. The
MIMO systems are able to simultaneously transmit multiple signals through
spatially parallel channels between isolated multiple antennas. In a MIMO system,
data throughput is substantially increased by the introduction of spatial multi-
plexing gain and diversity gain. Owing to these superior features, recently emerged
mobile communication standards relating to long-term evolution (LTE), worldwide
interoperability for microwave access (WiMAX) and IEEE 802.11a/b/n/g for
wireless local area networks (WLANs) have been incorporated into MIMO
technologies and adapted to handheld mobile applications.
Recently, various MIMO antennas for UWB or WLAN/WiMAX applications
have been reported [6, 7, 8, 9, 10]. However, there are some limitations in their
designs. In [7], the antenna only operates a frequency range of 1.79–3.77GHz,
which is not suitable for WLAN/WiMAX applications. A bandwidth of 51.6%
(2.30–3.90GHz) is achieved in [8], which is not suitable for long-term evolution
(LTE) applications. In [9] and [10], the MIMO antennas are suitable for UWB