Vehicular Glass Antenna Element Layout for Reception Sensitivity
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Solution Overview
Problem
Vehicular glass antennas face limitations in achieving sufficient reception sensitivity due to the position of the power supplying section, particularly when installed in vehicles with power supplying positions at corners or small window openings, restricting their installation and performance.
Innovation Solution
The antenna design includes a core wire-side and ground-side antenna element configuration where the core wire-side first element extends along an edge of the window opening with a predetermined distance from the edge, and the ground-side element extends along the core wire-side first element with a second predetermined distance, allowing the core wire-side second element to be positioned without being limited by the power supplying section, thereby reducing the influence of the vehicle body and enhancing reception sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second element section is extended to more than 150 mm to improve antenna gain, then reception sensitivity is improved, but the antenna can only be installed in vehicles with specific power supplying positions separated by at least 150 mm from the lower edge
Solution Approach 1:
The patent resolves this contradiction by utilizing both vertical and horizontal dimensions for element arrangement. When the power supplying position allows, the core wire-side second element extends vertically to achieve sufficient length for good reception sensitivity. When the power supplying position is constrained, the elements can be arranged horizontally instead, maintaining adequate element length and reception performance while adapting to the constrained installation space.
2Reliability
If the core wire-side first element extends along the edge of the window opening with a distance of less than 40 mm, then the influence of the vehicle body is reduced and reception sensitivity is enhanced, but the element must be positioned precisely which increases manufacturing complexity
Solution Approach 1:
The patent applies local quality by specifying that the core wire-side first element should extend along the edge of the window opening at a predetermined distance (less than 40 mm) only in the region where it runs parallel to the edge. This localized positioning requirement applies specifically to the first element section, while other sections can have more flexible positioning, thus reducing the overall manufacturing precision burden while still achieving the benefit of reduced vehicle body influence on reception sensitivity.
Data Source
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AI summary
A vehicular glass antenna includes a core wire-side power supplying section (20), a core wire-side antenna element (30) electrically connected to the core wire-side power supplying section, a ground-side power supplying section (40), and a ground-side antenna element (50) electrically connected to the ground-side power supplying section. The core wire-side antenna element includes a core wire-side first element (31) and a core wire-side second element (32). The core wire-side first element extends from the core-side power supplying section as a starting point along an edge of a window opening (5) of a vehicle body (1) in such a manner as to keep a first predetermined distance relative to a closest part of the edge of the window opening. The core wire-side second element extends from the core wire-side first element in a substantially vertical direction at a position (h1) separated by more than a prescribed distance from each of left and right edges (5b, 5d) of the window opening. The ground-side antenna element has a ground-side first element (51) extending from the ground-side power supplying section as a starting point along the core wire-side first element in such a manner as to keep a second predetermined distance relative to the core wire-side first element.