Sliding Slot Antenna Layout for Rollable Display RF Efficiency
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Solution Overview
Problem
The radiation efficiency of slot antennas in electronic devices with rollable displays is compromised when the housings are in a state where they are adjacent to each other, due to interference from the second housing affecting the first frequency band.
Innovation Solution
The electronic device incorporates a first housing with a first slot structure extending to its edge and a second housing with a second slot structure that can move relative to the first, allowing the wireless communication circuit to switch between using the first slot structure alone in one state and both slot structures together in another state, maintaining or improving antenna performance across different frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the second housing is disposed adjacent to the first housing to enable rollable display functionality, then the display area can be increased, but the radiation efficiency of the slot antenna in the first frequency band is deteriorated due to interference from the second housing
Solution Approach 1:
The antenna system is segmented into two independent slot structures: a first slot structure in the first housing and a second slot structure in the second housing. This segmentation allows each slot to operate independently, preventing mutual interference while maintaining antenna functionality across different display states
Solution Approach 2:
The antenna system dynamically changes its operational parameters by switching between different slot structures based on the display state. When the display is extended, the first slot structure is used; when rolled up, the second slot structure is activated. This parameter change adapts the antenna performance to different physical configurations
2Device complexity
If a single slot antenna is used in the first housing, then the device structure is simplified, but the antenna performance deteriorates when the second housing interferes with the first frequency band
Solution Approach 1:
The antenna system achieves multi-functionality by incorporating two slot structures that can operate independently or in combination. The first slot structure handles the first frequency band when the display is extended, while the second slot structure handles the same band when rolled up, making the antenna system universally functional across different display states
3Reliability
If the slot antenna operates in the first frequency band when the second housing is adjacent, then communication function is maintained, but radiation efficiency is compromised
Solution Approach 1:
The second slot structure acts as an intermediary solution when the first slot structure experiences interference from the second housing. By providing an alternative radiating path in the second housing, the system maintains communication functionality while avoiding the energy loss associated with the interfered first slot structure
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 design ensures consistent and efficient transmission and reception of RF signals across varying states, preventing deterioration of antenna performance and enabling operation across multiple frequency bands by adaptively utilizing the slot structures based on the device's configuration.
Implementation Method 1
a slot antenna disposed in a conductive region of the first housing may transmit or receive a radio frequency (RF) signal
Data Source
AI summary
An electronic device is provided that includes a slidable housing including a first housing and a second housing slidable with respect to each other, wherein the first housing includes a first conductive portion including a first slot, and wherein the second housing includes a second conductive portion including a second slot, a flexible display including a portion which is visible or not visible from an outside of the electronic device by sliding of the first housing or the second housing, and a wireless communication circuit configured to feed power to the first conductive portion including the first slot, wherein at least portion of the first conductive portion including the first slot operates as a first slot antenna, when the portion is visible from the outside of the electronic device by the sliding, and wherein the at least portion of the first conductive portion including the first slot and at least portion of the second conductive portion including the second slot operate as a second slot antenna, when the portion is not visible from the outside of the electronic device by the sliding.