2026-11-09 Latest Published
By Tao Yang
Yafei Wang
Progress In Electromagnetics Research Letters, Vol. 133, 6-14, 2026
Abstract
To address mutual coupling between antennas in MIMO antenna systems, this paper proposes a decoupling method for a MIMO PIFA using a defected ground structure (DGS) based on common-mode/differential-mode (CM/DM) theory. We use the CM/DM response relationship as an explicit design criterion to guide DGS structure evolution and the selection of critical geometric parameters. Simulation results show that the proposed PIFA MIMO antenna achieves more than 20 dB of port isolation over the 3.8-3.9 GHz band, with a peak isolation of 57 dB, while maintaining good impedance matching. Moreover, the measured results of the fabricated prototype agree well with the simulated results, further validating the effectiveness of the proposed method.
