Abstract
An effective method to reduce the radar cross-section (RCS) of an ultra-wideband multiple-input multiple-output (MIMO) antenna is proposed. In order to reduce the RCS of the antenna, the antenna patch is divided into two parts, each of which contains a half of the antenna patch. That half which is not connected to the feed line is omitted with its substrate. A perfect electric conductor wall is used in front of the minimized structure to compensate for the effect of the omitted part. An equivalent circuit model for the MIMO antenna is proposed. The equivalent circuit model is simulated and optimized using advanced design system (ADS). The ADS results of the equivalent circuit model exhibit a reasonable agreement with the full wave results of the antenna. According to the results, the antenna shows a noticeable RCS reduction, a low mutual coupling of < −17.5 dB and a proper impedance bandwidth of 8.8 GHz in the range of 3 to 11.8 GHz. The diversity performance of the proposed antenna for example, diversity gain, envelope correlation coefficient (ECC), and the total active reflection coefficient is analyzed as well and an ECC of <0.11 is achieved.
Published Version
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