Sliding Housing Antenna Layout With Capacitive Stub Coupling
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Solution Overview
Problem
In rollable electronic devices, the sliding motion of housings can cause overlapping of conductive portions used as antennas, leading to reduced radiation performance.
Innovation Solution
The implementation of a conductive stub in the second housing that is capacitively coupled to the conductive portion of the first housing in the slide-in state, maintaining antenna functionality and reducing radiation performance deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the first housing is slid into the second housing in the slide-in state, then the device achieves a compact form factor, but the conductive portions overlap and radiation performance is reduced
Solution Approach 1:
The conductive portion is divided into multiple segments: a first conductive portion on the first housing and a second conductive portion on the second housing. These segmented conductive portions are positioned to overlap in the slide-in state, but the segmentation allows them to function as separate antenna elements that maintain radiation performance through capacitive coupling between the segments.
Solution Approach 2:
Capacitive coupling acts as an intermediary mechanism between the first and second conductive portions. The coupling enables electromagnetic energy transfer and maintains antenna functionality despite the overlapping configuration, resolving the conflict between compact form factor and radiation performance.
2Device complexity
If conductive portions are used for both structural support and antenna function, then device complexity is reduced, but radiation performance is reduced when housings overlap
Solution Approach 1:
The conductive portions serve multiple functions: they provide structural support as part of the housing and simultaneously function as antenna elements for wireless communication. This multi-functionality reduces device complexity while the specific overlapping configuration with capacitive coupling maintains antenna performance.
Solution Approach 2:
The antenna system is designed to be dynamic, adapting its configuration based on the housing position. In the slide-in state, the conductive portions overlap and couple capacitively; in the slide-out state, they separate. This dynamic behavior allows the same structure to maintain radiation performance across different operational states.
3Adaptability or versatility
If the display area is expanded through sliding motion, then functionality is improved, but antenna performance becomes inconsistent across different states
Solution Approach 1:
The antenna system dynamically adapts to the sliding motion that changes the display area. As the housings slide relative to each other, the conductive portions transition between overlapping and separated configurations, maintaining radiation performance through capacitive coupling in the overlapping state and direct radiation in the separated state.
Solution Approach 2:
The electrical characteristics of the antenna system change based on the housing position. In the slide-in state, capacitive coupling alters the effective electrical length and impedance of the antenna elements. The system is designed to accommodate these parameter changes and maintain consistent performance across different operational states.
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 maintains consistent antenna performance across slide-in and slide-out states by capacitive coupling, ensuring effective wireless communication.
Implementation Method 1
a conductive stub disposed in the second housing and disposed to be connectable through capacitive coupling to at least a part of the conductive portion
Data Source
AI summary
An electronic device is provided. The electronic device includes a first housing comprising a first space and comprising a conductive portion, a second housing comprising a second space and slidably coupled to the first housing, a flexible display disposed to be supported by the first housing and the second housing and having a display area expanding when being transitioned from a slide-in state to a slide-out state, and a wireless communication circuit disposed in the first space and configured to transmit or receive a wireless signal in a designated frequency band via the conductive portion, wherein the electronic device comprises a conductive stub disposed in the second housing and disposed to be connectable through capacitive coupling to at least a part of the conductive portion in the slide-in state.