Internal Antenna for Mobile Device with Conductive Strip
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Solution Overview
Problem
Conventional internal monopole antennas in mobile devices require significant isolation distance from shielding metal cases to prevent coupling effects, limiting the compactness and efficiency of space usage.
Innovation Solution
A mobile device design featuring a ground plane with a conductive housing and conductive strips that are integrated to reduce the distance between the antenna and the shielding metal case, maintaining performance through a monopole antenna configuration with a first conductive strip and a second conductive strip electrically connecting to the housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal monopole antenna is separated from the shielding metal case by an isolation distance, then the antenna performance is not degraded by coupling effects, but the effective usage of internal spacing is limited and the device cannot achieve compact form factor
Solution Approach 1:
A conductive strip is introduced as an intermediary element between the monopole antenna and the shielding metal case. This conductive strip serves as a mediator that manages the electromagnetic coupling effects, allowing the antenna to be positioned closer to the shielding case while maintaining performance through controlled coupling rather than isolation.
Solution Approach 2:
The conductive strip is integrated with the shielding metal case structure, merging the shielding function with the antenna coupling management function. This integration allows the shielding case to also serve as part of the antenna system, enabling closer positioning without compromising performance.
2Volume of moving object
If the antenna is integrated closer to the shielding metal case, then the device achieves compact form factor and better space usage, but coupling effects between the antenna and shielding case degrade antenna performance
Solution Approach 1:
The conductive strip acts as a controlled intermediary that manages the electromagnetic interaction between the antenna and shielding case. By positioning and dimensioning this strip appropriately, the coupling effects are controlled to enhance rather than degrade antenna performance, enabling compact integration.
Solution Approach 2:
The invention changes the parameters of the antenna system by introducing a conductive strip with specific dimensions and positioning. This modifies the electromagnetic field distribution and coupling characteristics, allowing the antenna to operate effectively at closer distances to the shielding case than conventional designs permit.
3Device complexity
If conventional antenna design processes test the internal monopole antenna in stand-alone condition, then the design process is simplified, but other components such as shielding metal case, RF circuitry and battery are not considered which leads to uneconomical use of space
Solution Approach 1:
The conductive strip is pre-integrated with the shielding metal case structure during the design phase, establishing the coupled antenna-shielding system before final assembly. This preliminary integration ensures that space optimization considerations are built into the fundamental design rather than added later.
Solution Approach 2:
The shielding metal case is given multiple functions: it provides electromagnetic shielding, structural support, and serves as part of the antenna system through the integrated conductive strip. This multi-functionality reduces the need for separate components and optimizes space utilization.
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 allows for a more compact mobile device form factor while maintaining antenna performance, achieving better impedance matching and omni-directional radiation patterns within the UTMS band, with improved antenna gain and bandwidth.
Implementation Method 1
an antenna comprising a first conductive strip spaced apart from the conductive surface, and a second conductive strip electrically connecting the first conductive strip to the conductive surface of the conductive housing
Data Source
AI summary
A mobile device includes a ground plane, a conductive housing disposed on the ground plane including a sidewall, a first conductive strip spaced apart from the conductive housing, and a second conductive strip electrically connecting the first conductive strip to the conductive housing.