Design of 6 and 28 GHz Omnidirectional Circular Polarized Antenna for 5G Communication
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Date
2020-01-09
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Addis Ababa University
Abstract
The upcoming fifth generation (5G) of mobile communication that can enhance the capacity and
data rates attracts many attentions in recent years. One drawback of 5G technology is that it is
more prone to interference comparing to the other technologies. To overcome this problem 5G
infrastructure uses much smaller base stations instead of using the large cellular antenna that we
use today. To cover large area multiple number of small cells can be used. This makes the antenna
costy. So, nowadays omnidirectional circularly polarized antennas are commonly designed in 5G
technology to reduce sector antenna and the interference. Hence. Due to the various advantages of
omnidirectional circularly polarized antennas different methodology was used to design. However,
getting a good performed antennas based on their gain, radiation efficiency, low reflection
coefficient and small electrical size of antenna are the major challenges.
Therefore, in this paper a circularly polarization omnidirectional antenna which is applied to 5G
communication is designed to improve the gain. The essence of this research is combining two
different kinds of antenna in High Frequency Structure Simulator (HFSS) to achieve the
characteristic of omnidirectional radiation pattern and circular polarization. The two kinds of
antenna are dipole and negative magnetic permeability zeroth-order resonator respectively.
Because both of them are linear polarization and omnidirectional radiation pattern, the
characteristic of omnidirectional radiation pattern and circular polarization can be achieved as long
as they are combined in physical space with 90 degrees. The radiation pattern of antennas is
simulated to generate the gain. For the antenna designed at 6 GHz the gain is 1.9 dBi and for the
antenna at 28 GHz the gain is 2.0 dBi. Both antennas achieve circular polarization performance
and Omni-directional radiation within the operational band. This research output can be especially
applied to 5G small base stations in the future.
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Keywords
Dipole, MNG-TL, Zeroth-order transmission line, Omnidirectional circularly polarized antenna