Abstract
E-shaped multiple-input-multiple-output (MIMO) microstrip antenna systems operating in WLAN and WiMAX bands (between 5 and 7.5 GHz) are proposed with enhanced isolation features. The systems are comprised of two antennas that are placed parallel and orthogonal to each other, respectively. According to the simulation results, the operating frequency of the MIMO antenna system is 6.3 GHz, and mutual coupling is below −18 dB in a parallel arrangement, whereas they are 6.4 GHz and −25 dB, respectively, in the orthogonal arrangement. The 2 × 3 matrix of C-shaped resonator (CSR) is proposed and placed between the antenna elements over the substrate, to reduce the mutual coupling and enhance the isolation between the antennas. More than 30 dB isolation between the array elements is achieved at the resonant frequency for both of the configurations. The essential parameters of the MIMO array such as mutual coupling, surface current distribution, envelop correlation coefficient (ECC), diversity gain (DG), and the total efficiency have been simulated to verify the reliability and the validity of the MIMO system in both parallel and orthogonal configurations. The experimental results are also provided and compared for the mutual coupling with simulated results. An adequate match between the measured and simulated results is achieved.
Highlights
The current wireless communication systems have to fulfill the demands such as high data rates, increased capacity, high quality, and high reliability for different applications
In its simplest form, the use of multiple antennas is known as spatial diversity, and the element spacing factor affects the overall performance of the system
The mutual coupling is reduced by placing the electromagnetic band gap (EBG) metamaterial structure consists of a 2 × 3 matrix of C-shaped resonator (CSR) between the antenna elements
Summary
The current wireless communication systems have to fulfill the demands such as high data rates, increased capacity, high quality, and high reliability for different applications. Various methods have been studied and analyzed for suppression of mutual coupling and improvement of the isolation between the antennas, including the neutralization technique [4, 5], using electromagnetic band gap (EBG) structures [6,7,8] or etching slots or slits from the ground and forming defected ground structures (DGSs) [9, 10]. An additional coupling is introduced by connecting the two antennas with a thin metal strip. The mutual coupling is reduced by placing the EBG metamaterial structure consists of a 2 × 3 matrix of C-shaped resonator (CSR) between the antenna elements. It is showing that the proposed structure possesses a wideband metamaterial behaviour
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