Vehicle Glass Antenna Interference Reduction via Tri-Element Placement
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Solution Overview
Problem
In vehicle window glass antennas, close placement of antennas with different reception frequencies leads to interference, reducing their sensitivity due to mutual interference.
Innovation Solution
The configuration includes a first antenna with a power feeding point and element, a second antenna with its own power feeding point, and a third antenna with a longer path element placed between the first and second elements, or on opposite sides of their power feeding points, to minimize interference by optimizing the placement of elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If antennas are placed close to each other in the window glass, then the area occupied by antennas is reduced, but the receiving sensitivity of the antennas declines due to interference
Solution Approach 1:
The patent transitions from linear arrangement to two-dimensional planar arrangement of antenna elements. The third element is positioned between the first and second elements in the plane, creating a triangular or T-shaped configuration that optimizes spatial separation while maintaining compact overall footprint. This dimensional arrangement reduces mutual interference between antennas with close reception frequencies.
Solution Approach 2:
The patent applies different placement strategies to different antenna elements based on their specific characteristics. The third element with the longest path is strategically positioned between the other two elements, while the first and second elements are placed on opposite sides of the power feeding point. This localized optimization of each element's position minimizes interference while maintaining compact area.
2Device complexity
If antennas with close reception frequencies are placed close to each other, then the device complexity is reduced, but interference occurs between the antennas
Solution Approach 1:
The third element acts as an intermediary structure between the first and second antenna elements. By positioning this element with the longest path between the other two elements, it serves as a spatial mediator that separates the electromagnetic fields of the first and second antennas, reducing their mutual interference while maintaining a simple integrated glass antenna structure.
3Object-generated harmful factors
If the third element is placed between the first and second elements, then interference is minimized, but the manufacturing precision requirements increase
Solution Approach 1:
The patent employs asymmetric placement where the third element with the longest path is positioned between the first and second elements, while the first and second elements are placed on opposite sides of the power feeding point. This asymmetric configuration optimizes interference reduction while providing clear reference points (power feeding point and element intersections) that facilitate manufacturing alignment.
Data Source
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AI summary
A glass antenna placed in a window glass for a vehicle includes a first antenna that includes a first power feeding point, and a first element connected to the first power feeding point; a second antenna that includes a second power feeding point placed next to the first power feeding point, and a second element connected to the second power feeding point; and a third antenna that includes a third power feeding point placed next to the second power feeding point, and a third element connected to the third power feeding point and having a longest path longer than respective longest paths of the first element and the second element, and wherein at least a part of the third element is placed between the first element and the second element.