Transformable Device Antenna Ground Plane Segmentation
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Solution Overview
Problem
Transformable mobile devices experience degraded communication quality due to the interaction between antenna elements and nearby metal components when switching between modes, affecting antenna performance.
Innovation Solution
A transformable mobile device design featuring a ground metal plane with separate float portions and notches to minimize interference, allowing for mutual coupling that enhances antenna gain, particularly by positioning the main and auxiliary antennas close to these float portions when in tablet mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the antenna elements are positioned close to metal elements to reduce device size, then the device size is reduced, but the antenna performance is degraded due to interference from metal elements
Solution Approach 1:
The ground metal plane is segmented into a main portion and a float portion that are completely separate from each other. The float portion is positioned within a notch of the main portion, creating spatial separation between the antenna element and the continuous metal ground plane, thereby reducing interference while maintaining compact device size.
Solution Approach 2:
The float portion acts as an intermediary structure between the antenna element and the main ground plane. It provides a controlled coupling mechanism through mutual coupling effects, allowing the antenna to interact with the ground plane in a controlled manner that enhances performance without the detrimental effects of direct contact with large metal surfaces.
2Object-affected harmful factors
If the ground metal plane is made continuous to improve shielding, then shielding performance is improved, but antenna gain is reduced due to interference
Solution Approach 1:
The continuous ground metal plane is divided into separate main and float portions. This segmentation maintains shielding effectiveness through the main portion while the float portion provides controlled interaction with the antenna, preventing the degradation of antenna gain that would occur with a fully continuous ground plane.
Solution Approach 2:
Different portions of the ground metal plane are given different functions: the main portion provides shielding and grounding, while the float portion localized within the notch provides controlled coupling to enhance antenna gain. This local differentiation allows each portion to optimize its specific function without compromising the other.
3Reliability
If the antenna elements are positioned far from metal elements to reduce interference, then antenna performance is improved, but the device size increases
Solution Approach 1:
The float portion is positioned in three-dimensional space within a notch of the main ground plane, creating vertical and lateral separation between the antenna and the main metal surface. This multi-dimensional positioning allows the antenna to be close to the device boundaries while maintaining adequate separation from interfering metal elements through spatial arrangement in multiple dimensions.
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 maintains antenna performance and bandwidth while reducing device size, enhancing antenna gain by up to 3 dB compared to conventional designs, ensuring consistent communication quality across modes.
Implementation Method 1
when the transformable mobile device operates in the tablet mode, mutual coupling is induced between the first float portion and the main antenna, so as to enhance gain of the main antenna
Data Source
AI summary
A transformable mobile device operating in a notebook mode or a tablet mode is provided. The transformable mobile device includes a base, an upper cover, a hinge, a main antenna, and a ground metal plane. The hinge is connected between the base and the upper cover. The main antenna is disposed in the upper cover. The ground metal plane is disposed in the base, or on an outer surface of the base. The ground metal plane includes a main portion and a float portion. The float portion is completely separate from the main portion.