The ring antenna with circular probe feeding for MIMO systems

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 S
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, the envelope correlation coefficient and radiation patterns. The measurement applying at result reveals that the orthogonal position is the best case for applying at the frequency ranges of 1–4 GHz. The mutual coupling is less than −20dB and the average gain is 4.19 dBi.