Stepped Antenna Module Layout for Metal Housing RF Isolation
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Solution Overview
Problem
In electronic devices with metal housings, high-frequency RF signals emitted by antenna modules can be influenced by the metal material, leading to performance issues.
Innovation Solution
A stepped antenna module structure is implemented, with partial layers of varying sizes stacked to maximize the distance between the metal housing and the antenna module, including a first partial layer, a second partial layer with an antenna pattern, and a third partial layer, which are strategically positioned to minimize the influence of the metal housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna module is mounted close to the metal housing to save space, then the device size is reduced, but the metal housing interferes with high-frequency RF signals
Solution Approach 1:
A plastic plate is introduced as an intermediary component between the metal housing and the antenna module. This plate forms an inner space that positions the antenna module away from the metal housing, preventing harmful electromagnetic interference while maintaining compact device dimensions. The plate acts as a mediator that resolves the conflict between space utilization and signal quality.
Solution Approach 2:
The antenna module is positioned in a three-dimensional inner space created by the plastic plate, utilizing vertical spacing rather than horizontal distance. This dimensional approach allows the antenna to be effectively separated from the metal housing without increasing the device's footprint, solving the space versus interference contradiction.
2Reliability
If a separate antenna module is used for high-frequency operation, then RF signal quality is improved, but the device structure becomes more complex
Solution Approach 1:
The antenna module is integrated with the plastic plate structure, combining the housing component and antenna support into a unified assembly. This merging reduces the number of separate parts and simplifies the overall device structure while maintaining the benefits of a dedicated antenna module for high-frequency operation.
Solution Approach 2:
The plastic plate serves multiple functions: it forms part of the device housing, creates the mounting structure for the antenna module, and provides electromagnetic isolation from the metal housing. This multi-functionality reduces structural complexity by eliminating the need for separate components for each function.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
An electronic device is provided. The electronic device includes a housing, a plate attached to the housing to form an inner space together with the housing and includes a flat portion facing in a first direction and a curved portion extended from an edge of the flat portion and forming an obtuse angle with the first direction, and an antenna module positioned in the inner space. The antenna module includes a first partial layer, a second partial layer that includes a first antenna pattern, and is stacked on the first partial layer, and a third partial layer that includes a second antenna pattern, and is stacked on the second partial layer. When viewed from the first direction, the third partial layer overlaps at least a portion of the flat portion, and at least a portion of the second partial layer overlaps at least a portion of the curved portion.