Multi-band MIMO Antenna Using Coupling Stub for Isolation
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Solution Overview
Problem
Conventional MIMO antennas for vehicles face challenges in achieving high-frequency bandwidth and isolation due to limited antenna installation space and exposure to external environments, which degrades performance and appearance.
Innovation Solution
A multi-band MIMO antenna system for vehicles utilizing a coupling stub with a ground plate and printed circuit board (PCB) type planar radiation bodies, where the stub enhances bandwidth and isolation by minimizing interference between antennas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a plurality of antennas is used for MIMO system, then data transmission rate is improved, but electromagnetic mutual coupling and isolation between antennas deteriorate
Solution Approach 1:
A coupling stub is introduced as an intermediary element between adjacent MIMO antennas. The stub acts as a decoupling structure that reduces electromagnetic mutual coupling between antennas while maintaining their individual radiation performance. This intermediary component enables better isolation without requiring increased spacing between antennas.
Solution Approach 2:
The patent applies different structural characteristics to different parts of the antenna system. Specifically, coupling stubs are selectively placed in regions where electromagnetic coupling occurs, while other regions maintain their original radiation-optimized design. This localized modification approach improves isolation without compromising overall system performance.
2Reliability
If antenna spacing is increased to reduce mutual coupling, then isolation between antennas is improved, but antenna installation space requirement increases
Solution Approach 1:
The coupling stub serves as a space-efficient intermediary that provides decoupling functionality without requiring additional installation space. By introducing this intermediate structure between antennas, the system achieves improved isolation while maintaining compact antenna spacing suitable for vehicle installations.
Solution Approach 2:
Instead of solving the isolation problem by increasing horizontal spacing between antennas, the patent introduces coupling stubs that extend in a different spatial dimension. This dimensional approach allows isolation improvement without increasing the footprint area required for antenna installation.
3Adaptability or versatility
If shark fin antenna is exposed outside vehicle, then wireless communication service is enabled, but appearance is degraded and damage risk increases
Solution Approach 1:
The patent merges the antenna system with the vehicle body structure, integrating MIMO antennas into the vehicle's internal architecture rather than exposing them externally. This integration approach enables wireless communication functionality while protecting the antennas from external environmental damage and preserving vehicle appearance.
Solution Approach 2:
The antenna structures are nested within the vehicle body, with coupling stubs and radiation elements positioned inside the vehicle's structural framework. This nesting arrangement allows the antenna system to be housed within the vehicle's existing structure, providing protection while maintaining functionality.
Data Source
AI summary
Disclosed is a multi-band multiple-input/multiple-output (MIMO) antenna for a vehicle using a coupling stub, and an antenna system using the same. The multi-band MIMO antenna system includes a ground plate having a quadrangular planar shape, a first antenna mounted at one lateral edge of the ground plate while extending in a direction perpendicular to the ground plate, and a second antenna mounted at one longitudinal edge of the ground plate while extending in a direction perpendicular to the ground plate. In accordance with this configuration, the multi-band MIMO antenna system can support high isolation and wide high-frequency bandwidth.