High-Gain Compact Dual-Band (28/38 GHz) mmWave MIMO Antenna for 5G: Design and Analysis

Abstract

Compact 28/38 GHz mmWave antennas enable high-performance 5G MIMO communications. This paper presents the design and optimization of 28/38 GHz millimeter-wave (mmWave) antennas for high-performance 5G applications. The proposed antennas utilize patch and MIMO array configurations on low-loss substrates like Rogers RT5880 to deliver high gain and efficient radiation patterns. Defected Ground Structures (DGS) and parasitic elements enhance gain (> 7 dBi), minimize mutual coupling, and achieve an Envelope Correlation Coefficient (ECC) < 0.005, ideal for MIMO systems. Validation via CST Studio Suite simulations confirms return losses below −10 dB, radiation efficiency exceeding 80%, and excellent isolation in arrays. These antennas address path loss and atmospheric absorption in 5G mmWave networks, enabling ultra-high data rates for mobile devices, IoT, and next-generation wireless systems. The framework supports extensions to multi-band operation, beam-steering, and scalable MIMO configurations with sustained efficiency and low element correlation.