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This paper proposes the ring antenna with circular probe feeding for MIMO systems. The ring antenna structure was adjusted by using the circular probe feedings on the ground plane to increase bandwidth and arrangement the elements of array antenna in four cases. The structural tuning technique was used Computer Simulation Technology (CST) program to analyze the antenna characteristics such as S11,...
This paper proposes the design of high gain and broadband waveguide antenna which is fed by using a microstrip antenna is at 2.33 to 5.24 GHz. A feeding network is broadband microstrip antenna with the flower-shaped combined with the rectangular waveguide antenna to improve the directive gain. The proposed antenna can be fabricated on conventional low-cost materials by using FR4 and aluminum plate...
This paper presents the directive gain enhancement of rectangular slot antenna with L-shaped and double I-shaped slot etching and metal box adding technique at 2.45 GHz for wireless communications. In many previous antenna researches, a large size of traditional antenna and low directive gain are the defect of antenna. That defect can be overcome by increase of bandwidth. In this paper, by etching...
For MIMO beamforming, the Eigen Beamforming (EB) technique provides the best performance with the expense of knowing full channel information. To reduce such an expense, the Quantized Beamforming (QB) has been presented by using only some feedback bits to calculate the suitable beamforming vectors. However, QB has a drawback in the complexity of finding the beamforming vectors and it is more difficult...
In this paper, the verification of using angle domain processing for Multiple Input Multiple Output (MIMO) system is presented. This paper proposes the concept of angle domain processing by applying a Butler matrix into 4 ?? 4 MIMO systems. A butler matrix is the most attractive technique for constructing angle domain due to its low cost and easy to implement. The measured results are compared with...
This paper aims to present the benefit of using a Butler matrix for MIMO systems employing angle domain processing instead of array domain processing. By applying Butler matrix, the concept of angle domain processing can be realized in practice and it still takes a full advantage of multiple antennas. The different scenarios of a fading MIMO environments are examined. The simulation results on channel...
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