Wideband Terminal Antenna System Based on Babinet's Principle for Sub-6 GHz and Wi-Fi 6E/7 Applications

Area of Science:

• Electrical Engineering
• Electromagnetics
• Antenna Theory

Background:

• Broadband antennas are crucial for modern wireless communication systems, supporting multiple frequency bands.
• Existing antenna designs often face limitations in bandwidth, hindering performance for evolving mobile applications like 5G and Wi-Fi 6E/7.

Purpose of the Study:

• To introduce a novel input impedance analysis methodology based on Babinet's principle to achieve broader bandwidth.
• To design, fabricate, and measure a broadband Multiple-Input and Multiple-Output (MIMO) antenna system for 5G and Wi-Fi 6E/7 applications.

Main Methods:

• Analyzing input impedance of open-slot and planar monopole antennas using numerical calculations.
• Combining antenna types in parallel and validating the methodology using MATLAB-based four-dimensional image processing.
• Establishing an equivalent circuit model for the antenna element to verify the methodology's validity.

Main Results:

• Achieved a broadband antenna element operating from 2.6 GHz to 7.46 GHz.
• Developed an eight-element MIMO antenna system with isolation performance better than 12 dB.
• Obtained total efficiency higher than 45% with envelope correlation coefficients (ECCs) below 0.05.

Conclusions:

• The proposed impedance property analysis methodology offers an innovative approach to increase antenna bandwidth, applicable to various designs.
• The developed MIMO antenna system demonstrates suitability for 5G and Wi-Fi 6E/7 mobile applications due to its broadband characteristics and performance metrics.