A Compact MIMO Multiband Antenna for 5G/WLAN/WIFI-6 Devices.

Area of Science:

• Electromagnetics and Antenna Design
• Wireless Communication Systems
• Microwave Engineering

Background:

• The increasing demand for high-speed wireless communication necessitates advanced antenna solutions.
• Existing antenna designs often struggle to meet the size, performance, and isolation requirements for multiple frequency bands.

Purpose of the Study:

• To design and validate a compact, high-isolation multiband antenna for 5G cellular (3.50 GHz), 5G WiFi (5.50 GHz), and WiFi-6 (6.50 GHz) applications.
• To achieve miniaturization without compromising antenna performance and inter-element isolation.

Main Methods:

• A two-element Multiple-Input Multiple-Output (MIMO) multiband antenna was designed and fabricated on FR-4 substrate.
• Simulations were performed using CST Studio Suite 2020.
• Key performance metrics including gain, efficiency, Envelope Correlation Coefficient (ECC), Diversity Gain (DG), Total Active Reflection Coefficient (TARC), and Channel Capacity Loss (CCL) were evaluated.

Main Results:

• The miniaturized antenna (16 × 28 × 1.6 mm³) achieved high isolation (>15 dB) without a decoupling scheme.
• Peak gain reached 3.49 dBi with approximately 80% efficiency across the operating bands.
• Excellent diversity performance was confirmed with ECC < 0.04, DG > 9.50, TARC < -10 dB, and CCL < 0.4 bits/s/Hz.

Conclusions:

• The proposed compact MIMO multiband antenna meets the stringent requirements for 5G and WiFi-6 applications.
• The design offers a viable solution for space-constrained wireless devices requiring high performance and isolation.