Abstract
This paper presents a high performance circularly polarized multiple input multiple output microstrip patch antenna which is suitable for current high data rate requirements. Circular polarization has been achieved by dual feeding the signals in phase quadrature to the patch antenna. A polarization independent metamaterial has been designed. The designed metamaterial is used to enhance the gain of the antenna and used as a superstrate of this patch antenna. Using metamaterial superstrate, a gain as high as 13.6 dBi with a bandwidth of 15.4% has been achieved at 11 GHz. The structure has been fabricated and the simulated results are in good agreement with the measured results. Circular polarized antenna also reduces the delay spread due to multipath environment and provides high latency.
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