Vehicle Window Glass Antenna Layout for DAB Reception Near Defoggers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle window glass antennas face challenges in achieving high sensitivity for receiving DAB broadcasts due to limited installation area caused by defoggers, especially in vehicles with small rear glass areas or near-vertical attachment angles, leading to restricted vertical length and interference issues.
Innovation Solution
A vehicle window glass design with a DAB glass antenna positioned on the lower edge, incorporating a defogger with specific filament configurations to prevent standing waves, and a power supply part on the lower edge to enhance reception performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a defogger is provided together with the glass antenna, then the defogger can remove condensation or ice from the window glass, but the area over which the glass antenna can be disposed is narrowed, restricting the vertical length of the antenna
Solution Approach 1:
The patent transitions the antenna from a purely vertical orientation to an L-shaped configuration that extends in both vertical and horizontal dimensions. This dimensional change allows the antenna to achieve sufficient effective length for DAB reception while accommodating the defogger's space requirements, as the horizontal extension compensates for reduced vertical space.
Solution Approach 2:
The antenna is divided into multiple segments: a vertical element and a horizontal element forming an L-shape. This segmentation allows each part to serve its function optimally - the vertical element captures vertical polarization while the horizontal element provides additional length without interfering with the defogger placement area.
2Area of stationary object
If the glass area of the rear glass is small (as in hatchback cars with near-vertical attachment angles), then the overall glass area is limited, but the area in which the glass antenna can be disposed becomes extremely limited when a defogger is also provided
Solution Approach 1:
By extending the antenna horizontally in addition to vertically, the patent effectively utilizes both dimensions of the limited glass area. This allows the antenna to achieve sufficient length for DAB reception without requiring a large contiguous vertical space, making it suitable for small rear glass areas in hatchback vehicles.
Solution Approach 2:
The antenna design concentrates its structure in specific local areas - the vertical element near the top edge and the horizontal element extending toward the center - rather than requiring uniform distribution across the entire glass surface. This localized arrangement optimizes space utilization in limited glass areas.
3Object-affected harmful factors
If the DAB glass antenna is disposed on the upper edge side of the window glass, then antennas are less likely to be affected by obstacles, but the vertical length available is restricted by the defogger position
Solution Approach 1:
The L-shaped configuration allows the antenna to extend horizontally from the upper edge area toward the center of the glass, compensating for the restricted vertical length. This horizontal extension in another dimension maintains the antenna's effective length for reception while preserving its favorable position near the upper edge that reduces obstacle interference.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Improves DAB broadcast reception by optimizing antenna placement and defogger design, maintaining sensitivity even in restricted installation areas and reducing interference.
Implementation Method 1
a defogger formed on one surface of the glass plate and including a pair of bus bar parts that oppose each other and a plurality of hot wire parts that each extend horizontally and are arranged vertically, and in which both end portions of each hot wire part are respectively coupled to a different one of the pair of bus bar parts
Implementation Method 2
a DAB glass antenna including a power supply part that is disposed on a lower edge side of the glass plate and a first element connected to the power supply part, wherein the first element extends vertically from the power supply part
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
The present invention provides a technology that is able to improve the reception performance of DAB broadcasts. A vehicle window glass according to one aspect of the present invention is provided with a glass plate and a DAB glass antenna formed on one surface of the glass plate, and the DAB glass antenna includes a power supply part that is disposed on a lower edge side of the glass plate and a first element that extends vertically.