Dual-Coil Antenna Layout for Sliding Device Alignment
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Solution Overview
Problem
Flexible electronic devices with sliding displays face a reduction in antenna efficiency for short-range communication due to changes in device form, as the center of the coil becomes misaligned with the device's center when transitioning between closed and open states.
Innovation Solution
The electronic device employs a dual-coil system, where a first coil is activated in the closed state and a second coil is activated in the open state, ensuring the coil's center is aligned with the device's central axis in each configuration to maintain efficient short-range communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single coil is used for short-range communication in a flexible electronic device with sliding display, then the device structure is simple, but the antenna efficiency decreases when the device transitions between closed and open states due to coil misalignment
Solution Approach 1:
The single coil is divided into two separate coils (first coil and second coil) positioned at different locations within the housing. The first coil is positioned to align with the device center in the closed state, while the second coil is positioned to align with the device center in the open state. This segmentation allows each coil to be optimized for specific device configurations, resolving the contradiction between structural simplicity and antenna efficiency.
Solution Approach 2:
The system dynamically switches between the first coil and the second coil based on the device's state (closed or open). The processor controls which coil is activated depending on whether the flexible display is in the closed or open position, ensuring that the active coil is always properly aligned with the device center and external devices, thereby maintaining high antenna efficiency across different configurations.
2Reliability
If the coil center is fixed at the device center for optimal alignment in closed state, then antenna efficiency is maximized in closed state, but the coil becomes misaligned with device center in open state reducing communication efficiency
Solution Approach 1:
Different regions of the device housing are equipped with different coils optimized for local alignment requirements. The first coil is positioned in a location that aligns with the device center when closed, while the second coil is positioned in a location that aligns with the device center when open. This local optimization ensures that each coil performs optimally in its designated device state.
Solution Approach 2:
The dual-coil system provides universal short-range communication capability across multiple device states. By having both coils available and switching between them based on device configuration, the system achieves multi-functionality - maintaining high antenna efficiency whether the device is in closed or open state, thus adapting to different usage scenarios.
3Adaptability or versatility
If the flexible display slides out to increase display area in open state, then user interface capability is improved, but the coil misalignment with device center reduces short-range communication efficiency
Solution Approach 1:
The system performs preliminary positioning by placing the second coil at a location that anticipates the device center position when open. Before the device transitions to the open state, the system is already configured with the second coil in position, ready to be activated. This preliminary preparation ensures that when the flexible display slides out, the second coil is already correctly positioned to maintain alignment with the device center and external communication devices.
Data Source
AI summary
Various embodiments of the disclosure relate to an electronic device and a method for increasing efficiency of an antenna. The method may include performing a short-range communication function using a first coil in a closed state in which at least a portion of a first housing of the electronic device is slid into an inner space of a second housing of the electronic device, and performing the short-range communication function using a second coil in an open state in which at least a portion of the first housing is slid out of the inner space of the second housing. The disclosure provides various other embodiments.