Movable Housing Antenna Isolation for Stable Frequency Bands
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Solution Overview
Problem
Flexible electronic devices with movable housings face challenges in maintaining consistent antenna performance across different states due to coupling between conductive portions, leading to changes in radiation characteristics and frequency band coverage.
Innovation Solution
Incorporating non-conductive portions between conductive elements in the housings to reduce coupling and maintain antenna performance independently of the device's state, using impedance elements and switch circuitry to adjust resonance frequencies and ensure consistent frequency band coverage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If two or more housings are movably coupled to expand or contract the display region, then the display area is improved, but the radiation characteristic of the antenna is changed due to coupling between conductive portions
Solution Approach 1:
The housing is divided into multiple segments (first housing and second housing) that can move relative to each other, allowing the display area to be expanded or contracted while maintaining antenna performance through the non-conductive portion
Solution Approach 2:
A non-conductive portion is introduced as an intermediary element between the first and second conductive portions to prevent harmful electromagnetic coupling while allowing the housings to move relative to each other for display expansion/contraction
2Volume of moving object
If the second housing is inserted into the first housing, then the device is in a compact state, but coupling occurs between conductive portions changing antenna performance
Solution Approach 1:
The non-conductive portion acts as a mediator that prevents electromagnetic coupling between conductive portions even when the housings are in the inserted/compact state, maintaining antenna radiation characteristics while achieving compact form factor
3Area of moving object
If the second housing is extracted from the first housing, then the display region is expanded, but the conductive portions are spaced apart affecting frequency band coverage
Solution Approach 1:
The non-conductive portion maintains proper electromagnetic isolation between conductive portions regardless of the distance between housings, ensuring consistent frequency band coverage whether the display is expanded or contracted
Data Source
AI summary
An electronic device according to an embodiment comprises: a first housing including a first conductive portion and a side including a first non-conductive portion; a second housing including a second non-conductive portion and coupled to the first housing to be movable with respect to the first housing; a display; and a wireless communication circuit. The second non-conductive portion, in a first state, includes a first portion overlapping at least a portion of the first conductive portion and a second portion extending from the first portion to a first lateral surface of the second housing, and the second portion, in a second state, is spaced apart from the first non-conductive portion.