MIMO Array Antenna for High-Capacity Multiplexed Communication

High-Isolation Compact MIMO Antenna Based on Metamaterial Zeroth-Order Resonator Array

This technology is a MIMO array antenna for high-capacity multiplexed communication, featuring four antennas arranged with metamaterial zeroth-order resonator structures on a compact half-wavelength platform, with beamforming performed at the feed network.

In conventional MIMO antennas, reducing the spacing between radiating elements to less than half a wavelength increases mutual coupling, which degrades isolation. This has made it difficult to integrate many radiators into small terminals or base station modules to achieve large-scale multiplexing.

This technology minimizes interaction between individual resonators by arranging the resonant parts—consisting of outer and inner ring radiators, slit-type series feed networks, and shorting pins—at 90-degree angles to each other. By integrating with beamforming feed networks like Butler or Rotman lenses, it can be applied to 5G base stations and compact wireless terminal antenna modules, ensuring high-capacity simultaneous transmission and reception across multiple channels even in limited mounting spaces.

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Key Features:

• Antenna array consisting of first through fourth antennas arranged adjacently or at predetermined intervals
• Feed unit that supplies power to the antenna array and performs beamforming for the beam patterns formed by the array
• Resonator unit consisting of an outer ring first radiator and inner ring second radiator with inductance and capacitance components, a series feed network with slits, and a shorting pin
• Structure where the multiple resonant parts of each antenna have a radial zeroth-order resonance structure and are arranged at 90-degree tilt angles to each other

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This invention was developed with support from the Ministry of Science, ICT and Future Planning for the development of antennas for future radio services using hybrid radio media.

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