Researchers have developed an innovative multiple-input multiple-output (MIMO) antenna featuring an octagonal ring configuration and a connected ground plane. This design is specifically optimized to operate in the 5G sub-6 GHz n79 band, as well as in Wi-Fi 5 (5.15-5.85 GHz) and Wi-Fi 6E (5.925-7.125 GHz) bands. Fabricated on an FR-4 substrate, the antenna boasts a compact size of 38 × 58 × 1.6 mm³, making it suitable for integration into modern wireless communication devices.

The antenna's performance is characterized by a -10 dB impedance bandwidth spanning from 3.3 GHz to 7.2 GHz, thus covering all target bands. Furthermore, the isolation between antenna elements exceeds 15 dB, minimizing mutual interference and enhancing the efficiency of the MIMO system. The maximum measured gain is 5.2 dBi, and the antenna's efficiency surpasses 80% across the bands of interest, indicating excellent signal transmission and reception capabilities. These parameters demonstrate the viability of this design for high-speed communication applications.

The octagonal ring configuration, coupled with the connected ground plane, contributes to improved performance by optimizing current distribution and reducing losses. The ability to operate across multiple frequency bands with high efficiency and good isolation is crucial for current communication systems, which demand versatility and robustness. This advancement in antenna design contributes to the development of more compact and efficient 5G and Wi-Fi devices, facilitating the implementation of next-generation networks with increased capacity and reliability.