Abstract
This paper presents a full wave simulation and characteristic mode-based design of a multiple-input-multiple-output (MIMO) antenna at 5.8 GHz for wireless local area network applications. The driven analysis comprises two antennas that are placed orthogonal to each other. A metamaterial unit structure in the form of a rectangular loop resonator is placed around the antenna element to reduce the electromagnetic interference and to increase the isolation between the two monopoles. A characteristic mode technique is employed to find out the dominant mode of the proposed antenna without a feeding port. It was revealed that mode 1 was the dominant mode among the three modes used. The MIMO antenna is constructed and measured using a vector network analyzer. A good isolation of less than 25 dB was attained with a wide impedance bandwidth of 65.5%.
Highlights
The increasing demand for higher data throughput and the need for more reliable connections has motivated the use of multiple antenna techniques, which is a key feature for increasing the performance of wireless communication systems
When several antenna elements are placed close proximity to each other, the electric field generated by one antenna alters the current distribution on the other antennas, the radiation pattern and input impedance of each array element are distributed based on the presence of the other elements [7]
In order to reduce the space and mutual coupling between the antenna elements, researchers have used various methods including the use of defected ground structure s(DGS) [8,9], neutralization lines [10] and electromagnetic band gap (EBG) structures [11,12]
Summary
The increasing demand for higher data throughput and the need for more reliable connections has motivated the use of multiple antenna techniques, which is a key feature for increasing the performance of wireless communication systems. Different applications will have different properties when it comes to design, the major challenge faced by many space-limited applications are the difficulties in implementation and the increasing commutation in spatial diversity [5] Another challenge facing the design of MIMO antenna are the electromagnetic interactions among the array elements called mutual coupling [6]. Characteristic mode theory is a modal analysis technique for antennas of arbitrary shape It gives a clear understanding of the resonating frequency of specific modes, radiation patterns and the corresponding mode current [21,22,23,24,25]. A technique that utilizes metamaterial unit cell structure was developed with the aim of increasing isolation between MIMO radiating elements. UsedaaMIMO characteristic offer physical insight about operating principles and to and antennamode usingtometamaterial unit cells to giveantenna an insight regarding the isolation find the of resonating frequency specific modes. Construction and measurement of a MIMO antenna to verify the design concept and to confirm the simulated results
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