Vehicle Antenna Plate Fixation via Edge Protrusions
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Solution Overview
Problem
Vehicle-mounted antenna devices face misalignment issues due to vibrations, affecting the transmission and reception of radiowaves, particularly in antenna devices with thru-holes for power supply pins, which are not adequately secured.
Innovation Solution
The antenna device incorporates a plate with protrusions or depressions on its edges, which are covered by a head to prevent movement in multiple directions, ensuring strong fixation and maintaining transmission and reception characteristics through interference with supporters and projections within the case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the antenna element is disposed at a distance from the circuit substrate due to the power supply pin, then the antenna element can be positioned, but misalignment occurs under vibration
Solution Approach 1:
The invention transitions from single-point contact to multi-point contact by adding protrusions on the plate edge that engage with corresponding structures in the case. This dimensional expansion of contact points prevents misalignment in multiple directions simultaneously, resolving the position stability issue under vibration while maintaining the required distance for electrical connection.
Solution Approach 2:
The fixing mechanism is segmented into multiple independent contact points: the power supply pin provides vertical positioning, while multiple protrusions on the plate edge provide lateral positioning. Each segment handles a specific degree of freedom, collectively achieving complete alignment stability without compromising the antenna-substrate distance.
2Reliability
If the antenna element is strongly fixed to prevent misalignment, then alignment stability improves, but the structure becomes more complex
Solution Approach 1:
The protrusions are integrally formed with the plate, eliminating the need for separate fixing components. The case structure itself provides the corresponding engagement features, making the system self-contained and avoiding additional parts. This achieves strong fixation while minimizing structural complexity.
Solution Approach 2:
The positioning and fixing functions are merged into the basic structural elements of the plate and case. The protrusions serve both as structural features of the plate and as positioning elements, while the case simultaneously provides both support and engagement features. This integration avoids adding separate fixing mechanisms.
Data Source
AI summary
An antenna element comprises a plate with a first opening, the plate including a first main surface and a second main surface opposed to each other, and a case. The case comprises: a first projection projecting toward an inside of the case and passing through the first opening; a first head provided to a tip end of the first projection, the first head being in contact with the first main surface; and a first supporter in contact with the second main surface. A first protrusion protruding from the first main surface or a first depression recessed from the first main surface is provided on an edge of the first opening. The first head covers the first protrusion and is in contact with at least a part of the first protrusion, or covers the first depression and is in contact with at least a part of the first depression.