Vehicle Antenna Mounting Structure for Vibration Noise Reduction
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Solution Overview
Problem
Conventional antenna devices for vehicles face challenges in reducing abnormal noise generated by antenna elements hitting the case due to vibrations, while also facing issues of increased production time, cost, and weight, and limited material options for the case.
Innovation Solution
The antenna device incorporates a configuration where antenna elements are sandwiched between holding pieces on the enclosure's inner surface, with the sizes and intervals of these pieces set to minimize the difference in deflection between the enclosure and the antenna elements, thereby reducing noise and eliminating the need for fixing components like adhesives or heat sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If adhesive agents or heat sealing are used to fix the antenna element to the case, then the antenna element is securely fixed, but the production time increases due to curing or cooling time requirements
Solution Approach 1:
The patent replaces chemical bonding (adhesive) and thermal bonding (heat sealing) with a mechanical pressing structure. The pressing member applies mechanical force directly to the antenna element through the cushioning member, eliminating the need for curing or cooling time while achieving secure fixation.
Solution Approach 2:
The pressing structure is designed to be self-contained, where the pressing member integrated with the case provides automatic mechanical support and positioning for the antenna element during assembly, eliminating dependency on external adhesive application processes.
2Reliability
If adhesive agents are used to fix the antenna element, then the antenna element is securely fixed, but the adhesive force degrades due to environmental changes
Solution Approach 1:
The patent replaces chemical bonding with mechanical pressing, eliminating the degradation issues associated with adhesive agents. The mechanical pressing force is applied through a cushioning member that maintains stable contact pressure without being affected by environmental factors like temperature or humidity changes.
3Reliability
If heat sealing is used to fix the antenna element, then the antenna element is securely fixed, but the case material options are limited to thermoplastic resins
Solution Approach 1:
The patent replaces thermal bonding with mechanical pressing, which is not limited by material thermal properties. This allows the case to be made from any material including thermosetting resins, metals, or composites, as long as the material can withstand the pressing force and maintain structural integrity.
4Object-affected harmful factors
If highly stiff materials or thicker components are used to prevent deflection, then abnormal noise is reduced, but the component cost and product weight increase
Solution Approach 1:
The patent introduces a cushioning member as an intermediary between the antenna element and the pressing member. This cushioning member absorbs and distributes the pressing force, preventing excessive localized stress and deflection of the antenna element, thereby reducing abnormal noise without requiring the antenna element or case to be made from heavier, stiffer materials.
Data Source
AI summary
An antenna device including: an antenna element; an enclosure having a wall body on which the antenna element is placed in a state of being joined to an inner surface of the wall body; and a printed substrate on which the antenna element is mounted with a leg portion of the antenna element connected to one surface of the printed substrate, which is stored inside the enclosure. Holding pieces to sandwich the antenna element between the wall body of the enclosure and the holding pieces are formed at a predetermined interval on the inner surface of the wall body of the enclosure. Respective sizes of and intervals between the holding pieces are set such that a difference between a deflection amount of the wall body and a deflection amount of the antenna element when the enclosure vibrates is less than or equal to a predetermined value.