Dual-Band and Wideband Self-Decoupled MIMO Antennas With Four Hybrid Modes

• Published in: IEEE antennas and wireless propagation letters 2024-10, Vol.23 (10), p.3272-3276
• Main Authors: Tang, Wei, Sui, Jiangwei, Wang, Yan, Li, Du, Li, Junru, Zhu, Xiangwei
• Format: Article
• Language: English
• Subjects: Antenna decoupling; Antenna design; Antenna measurements; Antennas; Boundary conditions; Broadband; Broadband antennas; Conductors; Decoupling; Design optimization; Dual band; Electric conductors; Geometry; Hybrid modes; Impedance matching; mobile terminals; multiple-input–multiple-output (MIMO); mutual coupling; Scattering parameters; Wideband
• ISSN: 1536-1225; 1548-5757
• DOI: 10.1109/LAWP.2024.3434526

A dual-band and wideband self-decoupled multiple-input-multiple-output antenna design method using four hybrid modes is presented for mobile terminals. The perfect magnetic conductor and perfect electric conductor boundary conditions are utilized to analyze the four hybrid modes. It is found that by delicately optimizing the antenna geometry to make these four modes cancel out at two frequencies, self-decoupling can be achieved in the two bands simultaneously. Moreover, these four hybrid modes can be manipulated to be compatible with each other, so these two bands can be approached to achieve a wideband self-decoupling. Two demonstrational examples are designed to justify the proposed scheme. The results show that both the dual-band and wideband designs can achieve −10 dB impedance matching and 20 dB isolation across the desired bands, with the measured total efficiency higher than 71%.