The paper presents a 2-port MIMO antenna, which is designed to operate in the 5.745 GHz band for WLAN systems. The antenna is designed based on a combination of fractal geometry and metamaterial structure to reduce its size and enhance its bandwidth. The microwave laminate FR4-epoxy with permittivity = 4.4, thickness h = 1.6mm and dielectric tangent loss 0.02 is used as an antenna substrate. The result of the design is a compact size MIMO antenna with an overall size of 30.4x13.4mm. MIMO antennas achieve high performance through the evaluation of criteria as Envelope of Correlation Coefficient, ECC, Total Active Reflection Coefficient, TARC, and Channel Capacity Loss, CCL. All of them satisfied well the WLAN-MIMO system requirements.
Słowa kluczowe: MIMO antenna, fractal geometry, Minkowksi island, Metamaterials, CSRR, DSG, ECC, TARC, CCL
1. INTRODUCTION In recent years, multi-antenna technology has been interested and widely applied in wireless communication systems. This technology uses multiple antennas for both transmitting and receiving sides. The antennas at the communication circuit terminals are combined to minimize errors and optimize data rates. In fact, the diversity system antennas can exist as MISO (Multiple Inputs Single Output), SIMO (Single Input Multiple Outputs), or most complicated system, the MIMO (Multiple Inputs Multiple Outputs) [1-2]. In a MIMO system, the antenna designs, the most concerned parameters are the resonant frequency, the radiation pattern, and in addition, the interaction/ coupling effect between multi-elements of the antenna array is also concerned . In order to satisfy this requirement, the MIMO system antenna the separation of the elements need to be the half wavelength of the lowest operational resonant frequency. However, this makes the overall size of the MIMO system antenna terminals increased significantly. This leads to the urgent need of researching and designing of MIMO system antennas for radio communication systems, which are compact in size but still ensure isolation coefficient less than 10dB between elements. Therefore, in recent times, many antennae of MIMO system have been proposed to be applied in new information systems such as mobile phones, handheld device [...]
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