Embedded Housing Antenna Layout for Reliable EMC Signal Reception
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Solution Overview
Problem
Existing electronic devices face challenges in achieving effective radio signal transmission and reception due to unfavorable environments, particularly in automotive applications where EMC issues complicate the realization of antennas.
Innovation Solution
The design incorporates antennas on multiple sides of the housing using laser direct structuring, with a main antenna having a folded configuration and a secondary diversity antenna, allowing for increased surface area and improved emitting and receiving characteristics, while eliminating the need for connecting wires by direct contact through stud elements and springy contacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the antenna is formed on the inner side of the housing, then the device structure is simple, but the signal transmission and reception characteristics are poor
Solution Approach 1:
The patent extends the antenna from a single-plane configuration to a multi-dimensional structure by forming conductive layers on multiple surfaces of the housing (front, rear, and side walls). This spatial expansion into three dimensions increases the effective antenna surface area and improves signal characteristics without significantly increasing device complexity
Solution Approach 2:
The antenna conductive layers are integrated directly into the housing structure itself, nesting the antenna function within the existing housing form factor. The housing serves dual purposes as both structural enclosure and antenna substrate, eliminating the need for separate antenna components
2Area of stationary object
If the antenna surface area is increased by using multiple sides of the housing, then the signal emitting and receiving characteristics improve, but the device complexity increases
Solution Approach 1:
The housing structure is designed to serve multiple functions simultaneously: it provides mechanical protection for internal components, structural support for the device, and acts as the substrate for the antenna conductive layers. This multi-functionality increases antenna surface area without adding separate antenna components or increasing overall device complexity
Solution Approach 2:
The patent merges the antenna conductive layers with the housing structure by directly forming copper traces on the housing surfaces through laser direct structuring. This integration combines what would traditionally be separate components (housing and antenna) into a unified structure, increasing effective antenna area while maintaining simple device architecture
3Adaptability or versatility
If connecting wires are used to connect the antenna to the PCB, then the antenna can be positioned flexibly, but the device complexity and potential EMC issues increase
Solution Approach 1:
The antenna conductive layers are directly integrated with the PCB through laser-formed conductive paths on the housing that connect to PCB contact pads. This merging of the antenna structure with the circuit board eliminates the need for separate connecting wires, reducing device complexity and potential EMC issues while maintaining electrical connectivity
Solution Approach 2:
The patent extracts and eliminates the intermediate connecting wires from the traditional antenna-PCB connection path. By directly forming conductive traces on the housing that interface with PCB contact pads, the solution removes the wire harness and associated connectors, simplifying the overall device structure and reducing EMC concerns
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 solution provides enhanced wireless communication capabilities despite harsh conditions, maintaining a compact device form factor and ensuring reliable signal transmission and reception without additional covers or through holes.
Implementation Method 1
The principle of laser direct structuring (LDS) provides integration of conductive layers on plastics filled with specific additives activated through irradiation with laser energy
Implementation Method 2
the additives provide an anchoring material and catalyst for reductive copper deposition plating
Data Source
Figure 1~4
Figure 5
AI summary
Electronic device having at least one main antenna (1) where such antenna is formed as a conductive layer on walls of a housing (10) of the electronic device through a laser direct structuring process and has a first portion (2, 3) on an internal part of the housing, a second portion (4) forming a junction area on an edge between an interior part and an exterior part of the housing and a third portion (5) on an outer part of the housing in electrical continuity with the first portion through the junction area.