Segmented Metal-Frame Antenna Structure for Mobile Wideband RF
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Solution Overview
Problem
The incorporation of metal elements in mobile devices negatively affects the antenna's ability to support wireless communication, degrading the overall communication quality.
Innovation Solution
A mobile device design featuring a system circuit board with a metal frame that includes cut points to separate antenna elements, allowing for the formation of distinct antenna structures that are electrically connected to an RF module, thereby minimizing interference and enhancing communication quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If metal elements are incorporated into mobile devices to improve appearance, then aesthetic quality is improved, but antenna performance deteriorates due to interference with wireless communication
Solution Approach 1:
The metal frame is divided into multiple segments by introducing cut points, which separates the antenna elements from the metal structure. This segmentation allows the antenna elements to operate independently without being blocked by the continuous metal frame, thereby maintaining both aesthetic appearance and antenna performance.
Solution Approach 2:
The antenna elements are extracted or separated from the metal frame structure by creating cut points. This extraction removes the harmful interference of the metal frame on the antenna elements while preserving the metal frame's aesthetic function, resolving the contradiction between appearance and communication quality.
2Strength
If a continuous metal frame is used to provide structural support and aesthetic appearance, then mechanical strength is improved, but antenna operation bandwidth is reduced due to signal blocking
Solution Approach 1:
The continuous metal frame is segmented into discrete sections through cut points, which creates electromagnetic isolation between different regions. This segmentation maintains the structural support function of the metal frame while allowing antenna elements to operate across wider bandwidths without signal blocking from the metal structure.
3Shape
If metal frame components are positioned to maximize aesthetic design, then appearance quality is improved, but radiation efficiency of antenna elements is degraded
Solution Approach 1:
The antenna elements are extracted from the metal frame structure by introducing cut points, removing them from the harmful electromagnetic environment created by the continuous metal frame. This extraction enables the antenna elements to radiate energy efficiently without being blocked or distorted by the metal frame, while the frame itself retains its aesthetic design function.
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 effectively prevents the metal frame from degrading communication quality, improves antenna operation bandwidth, and increases radiation efficiency, supporting wideband operations including LTE and CBRS.
Implementation Method 1
The RF module is electrically coupled to the first feeding element, so as to excite the first antenna structure
Data Source
AI summary
A mobile device includes a system circuit board, a metal frame, one or more other antenna elements, a display device, a first feeding element, and an RF (Radio Frequency) module. The system circuit board includes a system ground plane. The metal frame at least includes a first portion and a second portion. The metal frame at least has a first cut point positioned between the first portion and the second portion. The metal frame further has a second cut point for separating the other antenna elements from the first portion. The first cut point is arranged to be close to a middle region of the display device. The first feeding element is directly or indirectly electrically connected to the first portion. A first antenna structure is formed by the first feeding element and the first portion.