This technology is an antenna isolation device for vehicle-mounted applications with metal grounding. It features a dielectric plate placed upright at a specific angle between multiple antennas, with the plate's edges wrapped in a modified open-loop metal rod containing a metamaterial. The modified open-loop acts as a parallel resonant structure with one end grounded to the metal base, suppressing surface currents and magnetic fields on thick metal surfaces.
For multiple antennas mounted on thick metal surfaces like those of cars or aircraft, high surface currents and diverse paths on the substrate make it difficult to prevent electromagnetic coupling between antennas or with surrounding metal structures. Existing methods, such as arranging split-ring resonators under the ground plane, suffer from excessively large structures in low-frequency bands below 1 GHz.
This technology creates a λ/4 loop of the low-band wavelength using metal rods matching the thickness of the metal ground, suppressing surface currents through parallel resonance. It further inhibits remaining coupling using metamaterials on the dielectric plate, such as split-ring resonators, fractal parallel plates, or Hilbert curve patterns. This allows multi-band or MIMO antennas to perform without interference even when placed closely together, including in bands below 1 GHz. It is ideal for vehicle telematics and aircraft antennas, enabling dense placement on narrow metal bodies while maintaining communication quality.
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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