Optimized Super-Wideband MIMO Antenna with High Isolation for IoT Applications.

Area of Science:

• Electromagnetics and Wave Propagation
• Antenna Theory and Design
• Wireless Communication Systems

Background:

• The demand for compact, high-performance antennas is crucial for the Internet of Things (IoT) and high-speed data transmission.
• Existing antenna solutions often face limitations in bandwidth, isolation, and form factor for advanced wireless applications.

Purpose of the Study:

• To propose and validate a compact, low-profile multiple-input-multiple-output (MIMO) diversity antenna with super-wideband (SWB) characteristics.
• To investigate the impact of structural configurations (mirror vs. orthogonal) on antenna performance, particularly mutual coupling and isolation.
• To demonstrate the suitability of the proposed antenna for IoT and high-speed data applications through simulation and measurement.

Main Methods:

• Design and simulation of a quad-port MIMO diversity antenna using four symmetric monopole-radiating elements on an FR4 substrate with a slotted ground plane.
• Comparative analysis of mirror fashion and orthogonal structural arrangements for the MIMO antenna.
• Fabrication and experimental measurement of the proposed antenna prototype.
• Performance evaluation including operating frequency range, diversity gain, envelope correlation coefficient (ECC), and isolation.

Main Results:

• The proposed MIMO-SWB antenna operates from 2.3 to 23 GHz, covering a super-wideband frequency range.
• High isolation level exceeding 20 dB was achieved within the operational band.
• The orthogonal structure demonstrated superior mutual coupling performance compared to the mirror fashion structure.
• Simulated and measured results showed good agreement, validating the antenna's performance.

Conclusions:

• The developed compact, low-profile MIMO diversity antenna exhibits excellent SWB characteristics, high isolation, and good diversity performance.
• The orthogonal structural design is effective in mitigating mutual coupling and enhancing isolation, making it suitable for demanding wireless applications.
• The validated performance confirms the antenna's potential for integration into IoT devices and systems requiring high-speed data capabilities.