The μ-negative metamaterial (MNG) two-element MIMO antenna design was proposed in this article for WiMAX (2.5–2.8 GHz), WLAN (3.2–5.9 GHz), and ITU band (8.15−8.25 GHz) applications. The first design of the MIMO antenna operates at 2.7 and 4.9 GHz frequencies. In order to reduce the mutual coupling, a defective ground structure is used. For further isolation improvement, an MNG unit cell is placed in between the two radiating elements at a distance of 10 mm. The designed antenna elements have better than −23 dB coupling isolation between the two radiating elements. Moreover, with MNG an additional frequency of 8.2 GHz is obtained, which is useful for ITU band applications. The proposed antenna bandwidth is expanded by 19% in the lower operational band, 20% in the second operational band, and 32% in the higher frequency band with the MNG unit cell. From the analysis, the proposed antenna is suitable for WiMAX/WLAN/ITU band applications because of its low enveloped correlation coefficient, and highest directive gain and low mutual coupling between the radiating components. The proposed antenna was simulated, fabricated, and measured with the help of the Schwarz ZVL vector network analyzer and anechoic chamber. Both measured and simulated results are highly accurate and highly recommended for WiMAX/WLAN/ITU bands.
A two-port novel Stacked Star multiple-input multiple-output (MIMO) antenna with a physical size of 46 × 23 × 3.2 mm<sup>3</sup> is proposed. The proposed MIMO is designed for wireless communication applications such as Wireless Local Area Network (WLAN) and International Telecommunication Union (ITU) band resonating at 5.4 and 8.5 GHz, respectively. The Star is designed by using a basic circular antenna, from which Star geometry is constructed with iterations to obtain the desired frequency bands using Rogers RT5880 with a thickness of 1.6 mm for Stacked Star. The Stacked Star structure allows a wide bandwidth at the desired frequencies of 5.2-5.5 GHz and 8.2-8.6 GHz, respectively. To minimize mutual coupling, a T-slot stub is placed between the radiating patches. The proposed structures are simulated using Computer Simulation Technology. The proposed design is fed with proximity feed coupling for good impedance matching. Further, it provides an improved isolation of -8 dB. The important characteristics of the antenna such as reflection coefficients, Voltage Standing Wave Ratio, surface current distributions, and radiation patterns, are examined. In addition to that, MIMO characteristics elements like envelope correlation coefficient (ECC), and diversity gain (DG) and group delay -11.3 and -14.2 ns are investigated. The ECC is less than 0.01, while the DG is near 10 Db, indicating good MIMO performance. The anechoic measurement chamber and Schwarz ZVL vector network were used to measure the target MIMO antenna. The simulated and measured result shows a high degree of similarity so that the proposed antenna is strongly suggested for WLAN and ITU bands.
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