This work introduces a dual-port MIMO antenna array engineered for terahertz (THz) application, with a strong emphasis on next-generation 6G wireless systems. The antenna employs a dual-microstrip patch configuration fabricated on a quartz substrate with copper metallization, occupying a compact footprint of \(95 \times 55~\upmu \text{m}^2\) with a thickness of \(1.6~\upmu \text{m}\) . A notable design innovation is the integration of a honeycomb-inspired slot array, etched within and around the patch elements, which significantly enhances surface current manipulation, resulting in improved bandwidth and radiation characteristics. The upper extended patch arrays further contribute to mutual coupling reduction and polarization purity without requiring complex decoupling structures. Full-wave electromagnetic simulations conducted using CST Microwave Studio demonstrate dual-band operation at 6.9 THz and 8.9 THz frequencies. The antenna exhibits superior return loss characteristics with values reaching \(-58\) dB and \(-35\) dB at the respective resonant frequencies. Consistent VSWR performance is maintained across both operating bands, while the system achieves operational bandwidths spanning 420 GHz and 250 GHz. The realized gain measurements show 5.9 dBi and 9.9 dBi performance at the lower and upper frequency bands, respectively. The MIMO setup ensures high isolation of 35 dB and an ECC below 0.0015. These results highlight the potential of the proposed honeycomb-slotted dual-patch design for high-speed, low-interference THz communications and sensing applications.