Curved-Screen Antenna Layout for Low-Frequency Signal Coverage
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Solution Overview
Problem
The challenge is to optimize antenna performance in terminal devices with curved screens, where extreme antenna clearance due to the screen's shape leads to poor signal coverage and reduced antenna radiator width, affecting low-frequency communication quality.
Innovation Solution
The antenna structure features a radiator with breaks on curved and non-curved side edges, a feeding point positioned between these breaks, and additional tuning and switching circuits to adjust radiation modes, allowing for improved low-frequency radiation efficiency by shifting the main radiation mode to the non-curved side edge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna radiator is placed near the curved screen edge to achieve compact device design, then the device form factor is improved, but the antenna clearance is reduced leading to poor signal coverage
Solution Approach 1:
The antenna radiator is divided into two separate radiation arms extending from the feeding point in opposite directions. This segmentation allows one arm to be positioned away from the curved screen edge (maintaining signal coverage) while the other arm can be closer to the screen (achieving compact design). The feeding point acts as the segmentation reference, creating independent radiation paths with different clearance requirements.
2Length of moving object
If the antenna radiator width is reduced to meet extreme antenna clearance requirements, then the antenna clearance is improved, but the radiation efficiency is reduced
Solution Approach 1:
The antenna structure employs asymmetric radiation arm length configuration, where one radiation arm is extended longer than the other. The longer arm provides sufficient radiation efficiency by maintaining adequate effective aperture, while the shorter arm satisfies the extreme clearance requirements. This asymmetric design breaks the traditional symmetric antenna structure to simultaneously achieve both clearance and efficiency goals.
3Loss of energy
If the radiation arm length is increased to improve low-frequency radiation performance, then the radiation efficiency is improved, but the device size increases
Solution Approach 1:
Different radiation arms are assigned different lengths based on their local functional requirements. The radiation arm positioned away from the curved screen is made longer to ensure adequate radiation efficiency and low-frequency performance, while the radiation arm near the screen is kept shorter to meet clearance constraints. This local quality differentiation allows each part of the antenna to be optimized for its specific operational context without increasing overall device volume unnecessarily.
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 configuration enhances antenna performance by optimizing radiation efficiency and coverage in extreme antenna environments, particularly for low-frequency bands (650-1000 MHz), improving user experience by maintaining signal quality under challenging conditions.
Implementation Method 1
the antenna structure has a low-frequency radiation mode that utilizes the radiation arm between the feeding point and the second break for radiation
Data Source
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AI summary
An antenna structure and a terminal device are provided. The antenna structure is applied to a terminal device with a curved screen (40). The antenna structure includes a radiator (21) and a feeding point (22). The radiator has a first break (211) and a second break (212) located on different sides, the first break is on one curved side edge, and the second break is on one non-curved side edge. The feeding point is electrically connected to the radiator and located between the first break and the second break. A length of a radiation arm between the feeding point and the first break is less than a length of a radiation arm between the feeding point and the second break. The antenna structure has a low-frequency radiation mode that utilizes the radiation arm between the feeding point and the second break for radiation.