Loop Antenna Housing Design for Mobile Terminal Radiation
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Solution Overview
Problem
The use of metal in mobile terminal designs deteriorates antenna radiation performance, and existing design methods to mitigate this issue either compromise on appearance and strength, increase production costs, or require extensive tuning and deformation of the device's external shape.
Innovation Solution
A mobile terminal design incorporating a circuit board with a main antenna and a housing that forms a loop antenna structure by extending an antenna adjacent opening through a slot in the case, allowing electromagnetic waves to induce current flow along a loop structure, thereby maintaining radiation performance without adding unnecessary materials or increasing thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If metal is used to form the outside of the mobile terminal, then the appearance and strength are improved, but the radiation performance of the antenna deteriorates
Solution Approach 1:
The patent segments the mobile terminal into metal and non-metal portions, creating a non-metal area around the antenna position. This segmentation allows the antenna to radiate signals without interference from metal while the rest of the terminal maintains its metal construction for strength and appearance.
Solution Approach 2:
The patent applies local quality by creating a specific non-metal region around the antenna while maintaining metal construction in other areas. This localized approach ensures optimal radiation performance at the antenna position while preserving the overall structural strength and aesthetic appearance provided by metal materials elsewhere in the terminal.
2Reliability
If a slot is formed in the metal plate to improve antenna radiation, then the radiation performance is improved, but the external appearance is deformed and extensive tuning is required
Solution Approach 1:
The patent extracts the non-metal portion from the metal housing, creating a separate non-metal area around the antenna. This extraction eliminates the need for slots or openings in the metal plate, preserving the external appearance while ensuring optimal antenna radiation performance.
3Reliability
If a connection part and welding process are added to connect metal and ground pad, then the radiation performance is improved, but the production cost increases and thickness increases
Solution Approach 1:
The patent extracts the non-metal portion from the metal housing, eliminating the need for connection parts and welding processes. This approach maintains radiation performance while reducing production complexity and avoiding increased thickness that would result from adding connection structures.
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
This design effectively prevents radiation performance deterioration, minimizes production costs, and maintains the device's original appearance and strength, with improved reflection loss and Voltage Standing Wave Ratio (VSWR) in higher frequency bands.
Implementation Method 1
a housing, mounted on the main antenna and the circuit board, for embodying a loop antenna having a structure for passing through a circumferential area of at least one of key buttons in order to radiate, when a signal radiated from the main antenna is output, the output signal
Data Source
AI summary
A mobile terminal that can prevent radiation performance deterioration of an antenna is provided. The mobile terminal includes a circuit board in which an antenna and one or more key buttons are mounted, a housing mounted on the antenna and the circuit board, and a case for enclosing a periphery of the one or more key buttons and having a plurality of openings according to the quantity of the key buttons, wherein an antenna adjacent opening among the plurality of openings is extended through a slot toward an edge of the case to embody a loop antenna. Therefore, radiation deterioration of an antenna due to a case can be prevented. In addition, production costs can be minimized, and a desired external appearance of the mobile terminal is not compromised.