Compact Four-Port Metasurface for Tri-Band Operation in X-Band MIMO Applications

Area of Science:

• Electromagnetics and Metamaterials
• Antenna Theory and Design
• Wireless Communication Systems

Background:

• Metasurfaces offer unique electromagnetic properties for antenna applications.
• Compact and efficient antennas are crucial for modern wireless systems.
• Multiple-Input Multiple-Output (MIMO) technology enhances data throughput and reliability.

Purpose of the Study:

• To design, fabricate, and validate a compact four-port metasurface for tri-band X-band MIMO applications.
• To achieve enhanced radiation performance, improved channel diversity, and reduced mutual coupling.
• To demonstrate the effectiveness of array scaling for gain enhancement.

Main Methods:

• A scalable unit-cell configuration was employed for metasurface realization.
• A 32x32 unit-cell array was designed and fabricated.
• Experimental characterization included S-parameters, radiation patterns, and MIMO performance metrics.

Main Results:

• The metasurface demonstrated good impedance matching at 8.75, 9.75, and 10.5 GHz.
• Realized gain exceeded 12 dBi, with a peak gain of approximately 13 dB.
• Excellent MIMO performance was confirmed with low ECC (<0.04), high DG (~10 dB), and low CCL (<4 bits/s/Hz).

Conclusions:

• The proposed metasurface is a promising candidate for compact, high-performance X-band MIMO systems.
• Array scaling is an effective method for enhancing gain without increasing complexity.
• The design supports advanced wireless communication and radar applications.