Foldable Housing Antenna Switching to Limit Parasitic Resonance
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Solution Overview
Problem
Foldable electronic devices experience antenna performance degradation due to user holding and parasitic resonance when parts of the antenna are grounded during folding, necessitating an adjustable antenna structure to mitigate these issues.
Innovation Solution
An electronic device with a switch circuit that adjusts the electrical length of the antenna by connecting or separating conductive portions on the housing based on user grip detection, reducing performance degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a foldable electronic device uses at least a part of a housing as an antenna, then the antenna structure is simplified and portability is improved, but antenna performance degrades when the user holds the device
Solution Approach 1:
The patent applies the dynamics principle by making the antenna structure adjustable through a switch circuit that changes the electrical length of the antenna based on device state (folded vs. unfolded). This allows the antenna to adapt its characteristics dynamically to maintain performance in different usage scenarios, resolving the contradiction between simplified structure and reliable performance.
2Reliability
If a segmentation portion positioned on a side surface of the housing is removed and then grounded to reduce performance degradation from user holding, then holding performance is improved, but parasitic resonance is introduced when the device is folded
Solution Approach 1:
The patent uses a switch circuit to dynamically control the grounding state of the segmentation portion. When the device is unfolded, the segmentation portion is grounded to prevent user holding degradation. When folded, the switch disconnects the grounding to avoid parasitic resonance. This dynamic control resolves the contradiction between improving holding performance and preventing parasitic resonance.
Solution Approach 2:
The switch circuit acts as an intermediary component that mediates between the segmentation portion and ground connection. It selectively enables or disables the grounding based on device state, allowing the system to benefit from grounding when needed while avoiding its harmful effects when folded, thus resolving the contradiction.
3Reliability
If the electrical length of the antenna is adjusted via a switch circuit, then antenna performance degradation is reduced, but device complexity increases
Solution Approach 1:
The patent implements a switch circuit that dynamically adjusts the electrical length of the antenna by connecting or disconnecting different conductive portions. This dynamic adjustment allows the antenna to maintain optimal performance across different device states (folded/unfolded) while using a relatively simple switching mechanism, thus resolving the contradiction between performance reliability and structural complexity.
Data Source
AI summary
Disclosed is a foldable electronic device including an antenna structure having an adjustable electric length by way of a switch circuit, thereby reducing antenna performance degradation in the foldable electronic device.