DESIGN OF VEHICLE OF ON-GLASS 4x4 MIMO ANTENNAS FOR WIBRO APPLICATIONS

초록

This paper proposes on-glass 4x4 MIMO antennas with broad bandwidth and high radiation gain, suitable for receiving WiBro internet applications in a commercial sedan. For the individual antenna body, we used a triangular-shaped patch that most efficiently satisfies broad-matching bandwidth. Then the inside of the triangular patch was partially removed to broaden the driver's field of view. To obtain detailed design parameters that exhibit optimum radiating performance, we used a genetic algorithm (GA) in conjunction with a full wave EM simulator and varied the feeding locations of four antennas so as to increase throughput capacity for effective data transmission. The proposed antenna showed -10 dB matching bandwidth and a measured average gain of about 4.77 dBi along the bore-sight direction (theta = 90 degrees, phi = 180 degrees) in the entire WiBro band (2.3-2.4 GHz). To confirm the MIMO performance in a real situation, we measured the commercial WiBro signal using the proposed antennas in an urban environment. The correlation coefficients among the antennas were calculated, and the result revealed an average value of 0.105.

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