Mobile Device Metal Frame Loop Antenna Design
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Solution Overview
Problem
Mobile devices with metallic textures for unique appearances often compromise signal reception due to the need for conductive structures, and existing solutions that form antennas damage the original frame structure or require significant clearance areas.
Innovation Solution
A mobile device design featuring a metal frame with a continuous loop structure on its periphery, where a resonance element is formed to create non-overlapping excitation paths for multiple frequency bands, maintaining a smooth appearance and reducing the required clearance area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a conductive structure is combined into the mobile device for metallic texture appearance, then the appearance uniqueness is improved, but the signal reception deteriorates
Solution Approach 1:
The metal frame is designed to serve dual functions: maintaining the metallic texture appearance and functioning as an antenna for signal reception. The continuous loop structure of the metal frame enables it to act as a loop antenna while preserving the aesthetic metallic appearance, thus eliminating the trade-off between appearance and signal reception.
2Reliability
If a notch is formed on the frame to create antenna terminals, then the antenna function is improved, but the streamline appearance deteriorates
Solution Approach 1:
The antenna terminals (feeding point and ground point) are extracted from the traditional frame structure and integrated into the continuous loop antenna formed by the metal frame itself. This eliminates the need for notches or gaps in the frame, as the antenna function is achieved through the frame's own continuous structure with strategically positioned connection points to the substrate.
3Reliability
If a gap is cut in the frame to form antenna structure, then the antenna performance is improved, but the frame structure integrity deteriorates
Solution Approach 1:
The metal frame is designed as a continuous loop structure that simultaneously serves as both the structural frame and the antenna element. By maintaining the frame's continuity and using it directly as the antenna path, the design achieves both structural integrity and antenna performance without requiring gaps or interruptions in the frame.
4Reliability
If a large clearance area is provided at the bottom for antenna formation, then the antenna operation is improved, but the device size increases
Solution Approach 1:
The antenna structure is transitioned from a planar configuration requiring large bottom clearance area to a three-dimensional loop structure formed by the vertical metal frame. This dimensional change allows the antenna to operate effectively within the device's height dimension rather than requiring extensive horizontal clearance, thus enabling device miniaturization while maintaining antenna performance.
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
The design enhances signal reception across multiple frequency bands while maintaining a sleek appearance and reducing the device's size, offering improved miniaturization and structural integrity.
Implementation Method 1
a resonance element formed on a portion of a periphery of the mobile device to receive and transmit a radio frequency signal
Data Source
AI summary
A mobile device having a periphery and including a substrate, a feeding line, and a resonance element is provided. The substrate has a ground plane and the feeding line is disposed on the substrate. The resonance element is formed on at least a portion of the periphery. The resonance element is electrically connected to the feeding line and the ground plane respectively via a first feeding point and a first ground point, so as to form a first excitation path. The resonance element receives and transmits a first radio frequency signal and a second radio frequency signal via the first excitation path.