A highly decoupled and compact co-circularly polarized MIMO filtering antenna array system for vehicular...

Area of Science:

• Electromagnetics and Antenna Engineering
• Wireless Communications
• Microwave Engineering

Background:

• Vehicular communication systems require high-performance antennas for reliable data transmission.
• Existing antenna solutions often face challenges with isolation and out-of-band signal rejection.
• The need for scalable and adaptable antenna systems is crucial for emerging vehicular technologies.

Purpose of the Study:

• To present a novel compact, single-layer, four-element multiple-input-multiple-output (MIMO) filtering antenna array.
• To achieve high inter-port isolation and sharp out-of-band frequency suppression for vehicular communication applications.
• To demonstrate the system's potential for supporting sustainable and intelligent transportation.

Main Methods:

• Designed a sequential phase feed network using three-pole hairpin resonator-based band pass filters, replacing traditional transmission lines.
• Utilized sequentially rotated corner-truncated rectangular patch antennas in a 2x2 configuration.
• Implemented electromagnetic field confinement using a cage structure and optimized element rotation (120°) to enhance isolation.

Main Results:

• Achieved out-of-band frequency suppression exceeding 24 dB (lower stop band) and 36 dB (upper stop band).
• Exhibited excellent inter-port isolation greater than 34 dB across the 5.4-6.3 GHz operating bandwidth.
• Demonstrated a -10 dB impedance bandwidth of 20% (5.3-6.5 GHz) and a 3-dB axial ratio bandwidth of 15.4% (5.4-6.3 GHz).
• Fabricated prototype achieved a peak realized gain of 11.3 dBic and an average realized gain of 10.5 dBic.

Conclusions:

• The proposed MIMO filtering antenna array system offers a compact and efficient solution for vehicular communications.
• The novel design provides superior isolation and filtering characteristics, crucial for reliable wireless connectivity.
• The system aligns with UN Sustainable Development Goals, promoting intelligent and sustainable transportation infrastructure.