Orthogonal MIMO Dipole Layout for Compact Antenna Isolation
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Solution Overview
Problem
Existing MIMO antenna devices face challenges in reducing interference between antennas while maintaining a compact size, particularly in vehicle-mounted applications where space is limited.
Innovation Solution
A MIMO antenna device design featuring front-side and back-side dipole antennas with specific feed part arrangements, including perpendicular long-side feed parts and overlapping feed points, along with coaxial cable wiring between surfaces, to minimize interference and achieve impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If antenna elements are installed apart from each other to ensure isolation, then interference between antennas is reduced, but the antenna device size increases
Solution Approach 1:
The patent transitions from planar antenna arrangement to three-dimensional orthogonal arrangement. The first dipole antenna is arranged in the horizontal direction while the second dipole antenna is arranged in the vertical direction, creating spatial separation in multiple dimensions. This orthogonal configuration reduces mutual coupling and interference between antennas while maintaining a compact overall device volume suitable for vehicle mounting.
Solution Approach 2:
The patent employs asymmetric arrangement of the two dipole antennas with different orientations - one horizontal and one vertical. This asymmetric spatial configuration breaks the symmetry of electromagnetic field distribution, reducing correlated interference between antennas while allowing the device to maintain a small form factor for vehicle integration.
2Volume of moving object
If antenna elements are arranged closely to reduce device size, then the antenna device can be mounted in vehicles, but isolation between antennas deteriorates
Solution Approach 1:
The patent utilizes three-dimensional orthogonal arrangement where the first dipole antenna extends in the horizontal direction and the second dipole antenna extends in the vertical direction. This multi-dimensional spatial separation allows the antennas to be physically close while maintaining electromagnetic isolation through orthogonal polarization, enabling compact vehicle mounting without sacrificing isolation performance.
Solution Approach 2:
The asymmetric orthogonal arrangement of dipole antennas with different orientations (horizontal vs. vertical) creates different electromagnetic field patterns that reduce mutual coupling. This asymmetric configuration allows close physical proximity for compact size while maintaining isolation through polarimetric diversity.
3Ease of manufacture
If conventional dipole antenna arrangements are used, then manufacturing is simple, but correlation coefficient reduction is insufficient for 5G high-speed transmission
Solution Approach 1:
The patent implements orthogonal arrangement of dipole antennas in three-dimensional space, with one antenna in the horizontal plane and another in the vertical plane. This spatial orthogonality significantly reduces the correlation coefficient between antenna elements, meeting 5G MIMO requirements for high-speed transmission, while maintaining relatively simple dipole structures that are easy to manufacture.
Solution Approach 2:
The asymmetric orthogonal configuration of dipole antennas with different orientations provides polarimetric isolation that reduces correlation coefficients. This asymmetric arrangement maintains manufacturing simplicity while achieving the low correlation coefficients required for reliable 5G high-speed transmission performance.
Data Source
AI summary
A MIMO antenna device includes a front-side dipole antenna and a back-side dipole antenna. Long-side feed parts for hot element are connected respectively to feed points at their long sides. Long-side feed parts for ground element are connected respectively to the feed points at their long sides, and the long sides thereof face the long sides of the long-side feed parts for hot element in parallel with a predetermined interval. Ground elements are respectively arranged point-symmetric to hot elements with respect to the feed points in an offset manner. The front-side dipole antenna and the back-side dipole antenna are arranged such that the front-side feed point and the back-side feed point substantially overlap each other in a top view and that the long-side feed part for front-side is arranged perpendicular to the long-side feed part for back-side.