In-Vehicle Antenna Holder Stress Isolation
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Solution Overview
Problem
In-vehicle antennas face issues with solder integrity due to coaxial cable stress from vibration and temperature changes, leading to potential disconnection and increased production costs, as existing solutions either compromise connection reliability or incur high manufacturing costs.
Innovation Solution
An in-vehicle antenna design featuring a sheet metal antenna body with an integrally formed element and ground part, combined with a resin antenna holder that securely holds the coaxial cable through heat-staked connections, reducing direct stress on soldered parts and minimizing component costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the coaxial cable is connected directly to the sheet metal antenna through soldering, then the connection is simple and low-cost, but the soldered part is vulnerable to pull forces and vibration stress causing disconnection
Solution Approach 1:
The antenna system is divided into distinct functional parts: the sheet metal antenna body, the resin antenna holder, and the coaxial cable. The antenna holder acts as a separate component that receives both the antenna body and the cable, isolating the soldered connection from mechanical stress. This segmentation allows the soldered joint to remain simple while the holder structure bears the mechanical loads.
Solution Approach 2:
The resin antenna holder serves as an intermediary component between the sheet metal antenna body and the coaxial cable. Instead of directly connecting the cable to the antenna through soldering, the holder mediates this connection by providing a mounting structure that secures both components, thereby protecting the soldered joint from pull forces and vibration stress.
2Reliability
If the coaxial cable is given sufficient extra length to avoid tensile load on the soldered part, then the soldered part is protected from pull forces, but the cable may cause resonation and contact with other components causing abnormal noise
Solution Approach 1:
The antenna holder is designed with predetermined cable routing paths and securing structures that guide the coaxial cable through its length. By pre-planning the cable's path and securing points within the holder, the system prevents excessive cable length from causing resonation while ensuring the cable has sufficient slack to avoid tensile loads on the soldered connection.
3Ease of manufacture
If sheet metal working is used to fabricate the antenna, then manufacturing costs are reduced, but the antenna lacks a integrated structure to protect the soldered part from stress
Solution Approach 1:
The antenna system combines different materials with complementary properties: the sheet metal antenna body provides low-cost fabrication and good electrical conductivity, while the resin antenna holder provides mechanical strength and stress isolation. This composite structure allows the inexpensive sheet metal antenna to benefit from the protective qualities of the resin holder, maintaining both cost-effectiveness and reliability.
Solution Approach 2:
The invention merges the sheet metal antenna body with the resin antenna holder into an integrated assembly. The holder is designed to receive and secure the antenna body, combining the advantages of both materials and structures. This merging creates a unified system where the simple, low-cost sheet metal antenna gains the protective capabilities of the more robust resin holder structure.
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
The design maintains solder integrity by distributing coaxial cable pull forces through the antenna holder, preventing stress on the antenna body and ensuring reliable connections while reducing manufacturing costs and enhancing vibration resistance.
Implementation Method 1
combined with a resin antenna holder that securely holds the coaxial cable through heat-staked connections
Data Source
AI summary
An antenna is disclosed. The antenna has an electrical cable, an antenna body including an element part and a ground part, the element part having an electric wire connecting part electrically connected with the electrical cable, and an antenna holder having an antenna holding part connected to the antenna body and a cable holding part holding the electrical cable.