A Compact Ultra-Wideband Millimeter-Wave Four-Port Multiple-Input Multiple-Output Antenna for 5G Internet of Things...

Area of Science:

• Electrical Engineering
• Antenna Design
• Wireless Communications

Background:

• Millimeter-wave (mmWave) frequencies are crucial for next-generation wireless systems, demanding efficient antenna solutions.
• Multiple-Input Multiple-Output (MIMO) technology enhances data throughput and reliability in wireless communications.
• Existing MIMO antenna designs often face challenges with size, bandwidth, and element isolation, particularly at mmWave frequencies.

Purpose of the Study:

• To present a compact, four-element MIMO antenna design optimized for mmWave communication bands (n257/n258/n261).
• To achieve wide bandwidth and high performance metrics including isolation, envelope correlation, and diversity gain.
• To miniaturize the antenna footprint for practical integration into mobile devices and base stations.

Main Methods:

• The design utilizes a single circular patch with an inset feed, augmented by a half-disk parasitic patch for improved reflection coefficient (S₁₁).
• Two vertical stubs on the ground plane are incorporated for fine-tuning antenna characteristics.
• A Rogers RT/Duroid 5880 substrate with ultra-thin thickness is employed for fabrication.

Main Results:

• The optimized four-port MIMO antenna achieves a compact size of 16.2 mm × 16.2 mm × 0.254 mm.
• It operates across the 24.25-29.5 GHz frequency range, offering a wide bandwidth of 5.25 GHz.
• Excellent MIMO performance is demonstrated with an Envelope Correlation coefficient (ECC) < 0.002, Diversity Gain (DG) > 9.99 dB, and isolation < -23.5 dB between elements.

Conclusions:

• The proposed compact MIMO antenna design meets the stringent requirements for mmWave communication systems.
• The design offers a compelling solution for high-performance, space-constrained wireless applications.
• The achieved parameters validate the effectiveness of the parasitic patch and ground stub modifications for miniaturization and performance enhancement.