Performance Analysis of Two-Terminal MIMO Antenna Array with Non-Identical Lishu Elements

This study examines mutual coupling in a two terminal MIMO antenna array with non-identical Lishu character elements. The dual-band Guo-shaped patch maintains a constant upper band resonant frequency at 3.7 GHz, while the single-band Jia patch is sensitive to separation distance D, with an optimal separation of 90 mm. Isolation levels at 3.5 GHz exceed 40 dB, decreasing as D increases. These findings offer insights for optimizing MIMO antenna performance.