Conductive Mobile Cover Resonant Frequency Band Coupling
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Solution Overview
Problem
Existing mobile cellular telephone apparatuses face challenges in providing both aesthetically pleasing and protective covers that also support multiple resonant frequency bands for efficient wireless communication.
Innovation Solution
A mobile cellular telephone apparatus featuring a conductive cover portion and a conductive member that electromagnetically couple to operate in multiple resonant frequency bands, allowing contactless feeding by an antenna, thereby enabling operation in various radio frequency protocols without altering the cover's design or dimensions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plastic cover is used to house and protect electronic components, then protection from atmospheric conditions and physical damage is improved, but aesthetic appeal and metallic appearance are compromised
Solution Approach 1:
The cover is constructed as a composite structure with a plastic substrate providing protection and a metallic coating layer providing aesthetic appeal. This allows the cover to simultaneously achieve both functional protection and desirable metallic appearance.
Solution Approach 2:
The cover features selective metallic coating applied to specific regions where aesthetic appeal is prioritized, while other regions maintain the protective plastic properties. This localized application of different material qualities optimizes both protection and appearance.
2Shape
If a metallic cover is used to provide aesthetic appeal, then appearance is improved, but electromagnetic interference with antenna operation may worsen
Solution Approach 1:
The metallic cover is segmented into multiple conductive portions with different resonant frequencies. Each portion is designed to resonate at specific frequency bands, allowing the cover to maintain aesthetic metallic appearance while managing electromagnetic interference through controlled resonance characteristics.
Solution Approach 2:
The electromagnetic parameters of the cover are modified by designing conductive portions with specific geometries and dimensions that create desired resonant frequencies. This allows tuning of the cover's electromagnetic response to be compatible with antenna operation across multiple frequency bands.
3Reliability
If the cover design is altered to support multiple resonant frequency bands, then wireless communication performance is improved, but design freedom and manufacturing complexity increase
Solution Approach 1:
The cover is designed to serve multiple functions simultaneously: providing physical protection, delivering aesthetic metallic appearance, and supporting multiple resonant frequency bands for wireless communication. This multi-functionality is achieved through conductive portions with varying thicknesses and geometries that can be integrated into the standard cover structure.
Solution Approach 2:
The antenna system and cover structure are merged into an integrated design where the cover's conductive portions directly participate in electromagnetic resonance. This integration eliminates the need for separate electromagnetic shielding components and simplifies the overall device structure while maintaining multiple frequency band support.
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 solution allows for enhanced design freedom in cover design while ensuring efficient wireless communication across multiple frequency bands, improving the apparatus's performance and user experience.
Implementation Method 1
The conductive member may be configured to electromagnetically couple with the first conductive cover portion
Implementation Method 2
the combination of the conductive member and the first conductive cover portion are operable in a second resonant frequency band
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
An apparatus including: a cover defining an exterior surface of the apparatus and including a first conductive cover portion; an antenna, connected to a feed point and configured to operate in at least a first resonant frequency band; a conductive member configured to couple with the first conductive cover portion, wherein the combination of the conductive member and the first conductive cover portion are operable in a second resonant frequency band, different to the first resonant frequency band and are configured to be contactlessly fed by the antenna.