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Compact Wideband MIMO Antenna for 5G
Fei Wang, Zhaoyun Duan*, Qian Li, Yanyu Wei, Yubin Gong
School of Physical Electronics
University of Electronic Science and Technology of China
Chengdu, China
[email protected], [email protected]*, [email protected], [email protected], [email protected]
Abstract—In this paper, we propose a compact wideband
antenna. The operation band of the antenna covers from 3 GHz
to 30 GHz with dimensions of 25 mm× 25 mm. The measured
antenna S-parameters are in good agreement with the simulated
ones. Furthermore, based on the proposed wideband antenna, a
two-element multiple-input-multiple-output (MIMO) antenna
with high isolation is developed due to its orthogonal polarization
directions. Due to the advantages such as wide bandwidth,
compact structure, and high isolation, this MIMO antenna is
suitable for the 5th generation (5G) communication.
To realize a wide bandwidth, we have improved the
monopole antenna. The original prototype of the monopole
antenna is presented in Fig. 1 (a). It’s a square monopole
antenna with coplanar waveguides (CPW) feedline. The
antenna is printed on FR4 substrate with relative permittivity of
4.4 and loss tangent of 0.06. The size of the antenna is 25 mm×
25 mm× 1 mm. By using the HFSS, we obtain the simulated
S11 parameters of the original monopole antenna, as shown in
Fig. 1 (c). It can be observed that the operation band of this
antenna covers from 3 GHz to 11 GHz.
Keywords—5G communication; microstrip antenna; MIMO
The improved monopole antenna is shown in Fig. 2 (a).
The slots 1 and 2 on the top side of the antenna and triangle
slots 3 and 4 on the sides of the antenna patch have been added
to extend the operation band of the antenna. The width of the
slots 1 and 2 are 2 mm and 1 mm, respectively. The S11
parameters of the antenna are illustrated in Fig. 1 (c). From Fig.
1 (c), we can see that the antenna operation band has been
extended as 3 GHz to 20 GHz.
Recently, the wireless communication technology is facing
the explosively increasing demands of high transmission rate,
stable communication quality, and complex application
scenarios. These demands have triggered the research of the 5th
generation (5G) cellular network in the world [1], [2].
Compared with the current wireless communication
technologies, the higher technical indexes lead to a wider
operation band of the 5G communication. In addition, the
lower frequency bands, especially under 3 GHz, are saturated
with all kinds of existing communication technologies [3], [4]
which cannot fulfill the requirements of 5G communication.
Therefore, current research about 5G communication is mainly
focused on the frequencies from 3 GHz to 30 GHz [5], [6].
As one of the most important components of the 5G
communication, the multiple-input-multiple-output (MIMO)
antennas for 5G communication have been widely studied [7],
[8]. Since the miniaturization has become the trend of wireless
communication, the size of the antenna must be small enough
to be integrated with other components. Therefore, realizing
wide band MIMO antenna in the limited space is a big
challenge for all the antenna researchers.
S11 (dB)
Focusing on these problems, we propose a compact
wideband antenna which is suitable for 5G communication.
Considering the compatibility of different wireless
communication modes, the operation band of the wideband
antenna is designed to be from 3 GHz to 30 GHz. Based on it,
a two-element MIMO antenna has been proposed using
orthogonal polarization. The proposed MIMO antenna can
realize a high isolation between antenna elements in the
operation band without increasing its size.
Without slots
With slots
Frequency (GHz)
Fig. 1. Dimensions of the antennas without slots (a) and with slots (unit: mm)
(b), simulated S11 parameters of the antennas without and with slots (c).
This work was supported in part by the National Natural Science
Foundation of China (Grant Nos. 61471091, 61611130067, and 61531010).
978-1-5386-3284-0/17/$31.00 ©2017 IEEE
AP-S 2017
To further extend the operation bandwidth, the antenna has
been designed as shown in Fig. 2 (a). A trapezoid patch (the
purple part in Fig. 2 (a)) is added on the back side of the
antenna which can couple the energy at higher frequency from
the feed line without influencing the performance at lower
frequency. The winglike structure on the two sides of the
antenna can couple energy from back side patch to make
operation band cover from 3 GHz to 30 GHz.
In order to validate the present approach, the proposed
antenna is fabricated, as shown in Fig. 2 (b). The measured S11
performance is presented in Fig. 2 (c) and compared with the
simulated results. From Fig. 2 (c), it is obvious that the antenna
operates from 3 GHz to 30 GHz which shows in good
agreement with the simulation.
S-parameters (dB)
Frequency (GHz)
Fig. 3. MIMO antenna geometry (a) and its S-parameters (b).
S11 (dB)
Frequency (GHz)
Fig. 2. Dimensions of the wideband antenna (unit: mm) (a) and its fabricated
prototype (b); simulated and measured S11 parameters of the antenna (c).
In this talk, we propose a compact wideband antenna.
Through adding slots on the antenna patch and adding extra
radiation patch on the back side, the proposed antenna has an
ultra-wide operation bandwidth (3 GHz–30 GHz) with a
compact structure (25 mm 25 mm). The experimental results
agree well with the simulated ones. Based on this wideband
antenna, we develop a two-element MIMO antenna. Since the
polarization directions of the two antenna elements are
orthogonal, the coupling between the two elements has been
reduced. This finding is verified from the simulated results.
The proposed MIMO antennas have potential applications in
miniaturized 5G communication devices.
Based on the above work, a two-element MIMO antenna
has been developed as shown in Fig. 3 (a). The MIMO antenna
consists of two same antenna elements, one of them has been
rotated 90 degrees to make sure that the polarization direction
of the two antenna elements are orthogonal. Therefore, the
coupling between two antenna elements has be reduced
without extending the space between them.
We use the HFSS to simulate the S-parameters of the
MIMO antenna, as shown in Fig. 3 (b). It can be observed that
the S21 parameter maintains under -20 dB which means the
high isolation between two antenna elements. Besides,
compared with Fig. 2 (c), the influence on the antenna return
loss is negligible.
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