Mobile Terminal Antenna Radiation Region Slit Design
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Solution Overview
Problem
Mobile terminals with metallic cases face challenges in antenna performance due to the complexity of fabrication processes and potential noise interference from internal electronic components, which affects the radiation quality and weight of the device.
Innovation Solution
A mobile terminal design featuring a metal frame with a radiation region formed by slits etched into a plate-shaped base and filled with a molding portion, which includes a connection protrusion to the feeding portion, minimizing noise interference and enhancing radiation quality while simplifying fabrication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a metallic case is used to form the terminal body, then the appearance is sophisticated, but the fabrication process becomes complicated and the weight increases
Solution Approach 1:
The metallic case is divided into multiple components: a frame structure and a separate back cover. The frame includes a radiation region with slits that form the antenna, while the back cover is attached to complete the case. This segmentation simplifies fabrication by allowing each component to be manufactured independently and assembled together, reducing the complexity of forming holes and ribs in a single piece.
2Shape
If a metallic case is used to form the terminal body, then the appearance is sophisticated, but the weight increases
Solution Approach 1:
By segmenting the case into a lightweight frame structure and a separate back cover, the overall weight is reduced compared to a solid metallic case. The frame provides structural support and antenna functionality, while the back cover can be made from lighter materials or thinner metal, achieving a balance between sophisticated appearance and reduced weight.
3Device complexity
If an antenna radiator is formed using the metallic case, then the structure is integrated, but the antenna quality is lowered due to case shape and noise from internal electronic components
Solution Approach 1:
The radiation region is segmented from the rest of the metallic case by forming slits that electrically isolate it. This segmentation allows the radiation region to function as an independent antenna element, preventing noise from other parts of the case and internal electronic components from degrading antenna quality, while maintaining overall structural integration.
Solution Approach 2:
A molding portion is introduced as an intermediary material to fill the slits in the radiation region. This molding portion acts as an electrical insulator, ensuring complete electrical isolation of the radiation region from other conductive parts of the case, thereby preventing unwanted electrical contact and noise interference while maintaining the structural integrity and aesthetic appearance of the case.
4Reliability
If the radiation region is formed by etching slits and filling with molding portion, then electrical contact is prevented, but the fabrication process becomes more complex
Solution Approach 1:
The slit formation and molding portion insertion processes are merged into a single integrated fabrication step. The slits are formed by etching, and the molding portion is injected to fill them in the same manufacturing cycle, ensuring complete electrical isolation while streamlining the fabrication process. This combining of operations achieves reliable electrical isolation without proportionally increasing fabrication complexity.
Data Source
AI summary
A mobile terminal includes: a terminal body; an antenna portion having a feeding portion disposed in the terminal body; a metal case which forms appearance of the terminal body, and configured to support inside of the terminal body; and a molding portion formed at a region of the metal case, wherein the metal case includes a side region which forms a side surface of the terminal body and including a radiation region implemented as a radiator of the antenna portion; and a connection protrusion extended from the radiation region and connected to the feeding portion, and wherein the side region is provided with a plurality of slits, and the molding portion is formed at the plurality of slits so as to divide the radiation region.