Mobile Device Antenna Structure with Integrated Metal Frame
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Solution Overview
Problem
The incorporation of metal elements in mobile devices negatively affects the antennas used for wireless communication, degrading the overall communication quality.
Innovation Solution
A novel antenna structure comprising a ground element, radiation elements, a matching circuit, and metal frames is introduced, where the metal frames are integrated as part of the antenna structure to prevent interference and enhance communication quality, covering frequency bands from 791 MHz to 2700 MHz.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If metal elements are incorporated into mobile devices to improve appearance, then device appearance is improved, but antenna performance deteriorates due to interference
Solution Approach 1:
The patent merges the metal frame structure with the antenna system by coupling the first metal frame to the third radiation element and the second metal frame to the ground element. This integration transforms the metal frame from a purely aesthetic component into a functional antenna element, eliminating interference while maintaining appearance benefits
Solution Approach 2:
The patent converts the harmful interference effect of metal frames into a beneficial feature by designing the metal frames to serve as antenna elements themselves. The metal frames are strategically positioned and dimensioned to support resonance at specific frequency bands, turning what was previously a source of interference into a functional radiation element
2Reliability
If traditional antenna structures are used, then antenna function is achieved, but communication bandwidth is limited
Solution Approach 1:
The patent implements multi-functionality by designing the antenna structure to support multiple frequency bands simultaneously. The first resonant path covers low-frequency bands (791-960 MHz) and second high-frequency bands (1710-2170 MHz), while the second resonant path covers third high-frequency bands (2500-2700 MHz), allowing a single antenna structure to perform multiple communication functions
Solution Approach 2:
The patent utilizes three-dimensional space by positioning radiation elements and metal frames at different heights and orientations. The first metal frame is disposed on a plane perpendicular to the dielectric substrate, creating vertical separation between resonant paths and enabling independent optimization of different frequency bands
3Reliability
If antenna size is increased to improve communication coverage, then communication quality improves, but device compactness deteriorates
Solution Approach 1:
The patent embeds multiple functional elements within a compact structure. The matching circuit is integrated near the radiation elements, the metal frames are coupled to existing antenna elements rather than adding separate structures, and the resonant paths are arranged to share common components, achieving nested integration that reduces overall antenna volume
Solution Approach 2:
The patent optimizes the electrical parameters of the antenna structure by adjusting the dimensions and positions of radiation elements and metal frames to achieve resonance at multiple frequency bands. The total length of resonant paths is controlled to be substantially equal to or shorter than 0.25 wavelength of the central frequency, enabling compact design while maintaining communication quality
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 solution effectively improves communication quality by preventing metal frame interference, reducing antenna size, and increasing bandwidth while maintaining a sleek device appearance.
Implementation Method 1
A signal source is coupled to a feeding point on the first radiation element, so as to excite the antenna structure
Implementation Method 2
The matching circuit includes a capacitor and an inductor coupled in parallel
Implementation Method 3
A first resonant path is formed by the first metal frame, the third radiation element, the matching circuit, and the first radiation element
Data Source
AI summary
A mobile device includes a ground element, a first radiation element, a second radiation element, a third radiation element, a matching circuit, and a first metal frame. The first radiation element and the second radiation element are both coupled to a grounding point on the ground element. The second radiation element and the first radiation element extend in opposite directions. The third radiation element is coupled through the matching circuit to the first radiation element. The first metal frame is coupled to a connection point on the third radiation element. An antenna structure is formed by the first radiation element, the second radiation element, the matching circuit, the third radiation element, and the first metal frame. A signal source is coupled to a feeding point on the first radiation element, so as to excite the antenna structure.