Simple 8-port 2 × 2 multiple-input multiple-output patch antenna for reduced complexity and isolation for Ku-band applications

Abstract A compact 8-port 2 × 2 Multiple-Input Multiple-Output (MIMO) Microstrip Patch Antenna (MPA) is designed for Ku-band (14.5 GHz) applications, offering a simplified yet highly efficient structure. The antenna, built on an FR4 substrate using square patches and microstrip feeding, effectively addresses mutual coupling and gain challenges in closely spaced MIMO systems. Performance is optimized through orthogonal feed placement, Defective Ground Structures (DGS), and parasitic patch elements. Simulation results demonstrate strong performance, with isolation better than –20 dB, peak gain of 5.7 dB, and a 1.02 GHz bandwidth. Key MIMO parameters, including diversity gain (∼10 dB), envelope correlation coefficient (< 0.02), and channel capacity loss (< 0.4 bps Hz −1 ), confirm that the antenna is suitable for high-data-rate applications. Fabrication and experimental testing in an anechoic chamber show good agreement with simulation outcomes. The proposed design provides an effective, low-cost option for compact, high-performance MPAs in satellite communication, vehicular networks, and next-generation wireless systems.