Sliding Metal-Frame Antennas for Stable Low-Band Ground Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Rollable electronic devices face challenges in maintaining antenna performance, particularly at low bands, due to changes in size and configuration, which affect the antenna design space and ground current paths.
Innovation Solution
A mobile terminal design with a slide metal part and a coupling link system that adjusts antenna positions and ground paths to maintain performance across different sizes, using a spring contact mechanism and multiple conductive members to ensure consistent antenna feeding and ground connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device size is reduced, then portability is improved, but antenna performance at low bands deteriorates
Solution Approach 1:
The patent employs a variable mechanism structure that allows the device to dynamically change its configuration between extended and retracted states. The metal frames are designed to be movable relative to each other, enabling the antenna system to adapt its ground path length according to the device's operational state, thereby maintaining antenna performance across different sizes.
Solution Approach 2:
The invention changes the physical parameters of the antenna system by adjusting the ground path length through the variable mechanism. When the device is retracted, the system modifies the electrical characteristics of the antenna by changing the effective ground path length, compensating for the reduced physical size and maintaining low band antenna performance.
2Adaptability or versatility
If metal frames are separately provided for variable mechanism structure, then rollable display is enabled, but antenna performance cannot be secured
Solution Approach 1:
The patent merges the structural function of the metal frames with the antenna function. The separately provided metal frames necessary for the variable mechanism are simultaneously utilized as antenna elements and ground paths. This integration allows the rollable display mechanism to maintain antenna performance by using the same structural components for both mechanical support and electromagnetic radiation.
Solution Approach 2:
The metal frames serve multiple functions: they provide structural support for the rollable display mechanism, act as antenna radiating elements, and function as ground paths for the antenna system. This multi-functionality resolves the contradiction by making the separately provided frames beneficial for both the variable mechanism and antenna performance.
3Area of stationary object
If ground region physical length is reduced, then device compactness is improved, but low band antenna performance deteriorates
Solution Approach 1:
The patent compensates for the reduced ground region area by utilizing the third dimension through the variable mechanism's movement. The ground path length is extended in the directional dimension provided by the mechanism's extension, allowing the system to maintain adequate ground path length for low band performance even when the footprint area is reduced for compactness.
Data Source
AI summary
Provided is a mobile terminal changing in size according to one embodiment. The mobile terminal comprises: a slide metal part; a front metal part formed to be coupled to the slide metal part; and a coupling link formed to couple the slide metal part and the front metal part in a folded state or an extended state. A plurality of antennas are disposed on the left surface, the right surface and the lower surface of the slide metal part, and at least one surface of the slide metal part is ground-connected to a PCB, which is accommodated in the slide metal part, at a plurality of points, and thus a difference in the lengths of ground paths is reduced in accordance with a relative movement to reduce a change in antenna performance of the plurality of antennas due to the relative movement.