Designed and simulated a compact 2×2 MIMO dual rectangular-slotted microstrip patch antenna operating at 2.104 GHz for S-band wireless applications. The design was developed from a reference single-element antenna and optimized through slot-position tuning and inset-feed adjustment to achieve improved impedance matching and diversity performance using CST Studio Suite. 

Objectives

• Design a compact 2×2 MIMO microstrip patch antenna for S-band operation.

• Optimize slot locations and inset-feed dimensions for improved impedance matching.

• Evaluate mutual coupling, isolation, bandwidth, and diversity performance.

• Analyze radiation characteristics, efficiency, and surface current distribution.

• Validate MIMO performance through ECC and multi-port S-parameter analysis.

Outcomes & Contributions

• Developed a four-port 2×2 MIMO antenna operating at 2.104 GHz.

• Achieved excellent impedance matching with all ports below −22 dB.

• Obtained low mutual coupling with isolation reaching −33 dB between diagonal elements.

• Achieved a realized gain of 3.57 dBi with radiation efficiency between 52–54%.

• Achieved extremely low ECC (0.000466), demonstrating excellent diversity performance.

• Performed comprehensive analysis of S-parameters, VSWR, bandwidth, efficiency, radiation patterns, and surface current distribution.

Technical Details & Skills

• Feed Technique: Inset-fed Microstrip

• Substrate: εr = 4.08, thickness = 1.5 mm

• Tools: CST Studio Suite

• Performance Metrics: S-Parameters, VSWR, Bandwidth, Isolation, ECC, Gain, Radiation Efficiency

• Skills: MIMO antenna design, impedance matching, slot optimization, multi-port analysis, radiation pattern analysis, diversity performance evaluation

• Field: RF Engineering, Microwave Engineering, Wireless Communications, Antenna Design