Rollable Mobile Antenna Frame Contact Layout for Parasitic Resonance
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Solution Overview
Problem
Rollable electronic devices face challenges in maintaining consistent antenna performance due to metal frames with variable structures, leading to parasitic resonance issues as the device changes size.
Innovation Solution
A mobile terminal design with slide and front metal parts connected by a contact member at different positions to manage parasitic resonance, utilizing contact members to ground the current path at specific wavelengths, ensuring consistent antenna performance across varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a variable mechanism structure is used to enable the display region to be expanded or retracted, then the adaptability of the device is improved, but the antenna performance becomes unstable due to parasitic resonance
Solution Approach 1:
A contact member is introduced as an intermediary element between the slide metal part and front metal part. This contact member includes a contact portion that electrically connects the two metal parts at different positions (first position near lower end of slot region, second position near upper end of slot region), serving as a mediator to control and eliminate parasitic resonance while allowing the display region to expand or retract
2Ease of manufacture
If metal frames are separately provided for the variable mechanism structure, then the ease of manufacture is improved, but the antenna performance deteriorates due to difficulty in securing continuous electrical connection
Solution Approach 1:
The contact member acts as an intermediary that bridges the separately provided metal frames (slide metal part and front metal part). By providing a contact portion that electrically connects these separate frames at controlled positions, the invention maintains antenna performance while preserving the manufacturing advantages of separate frame assembly
3Reliability
If the contact member connects the slide metal part and front metal part at different positions, then the parasitic resonance is eliminated, but the device complexity increases
Solution Approach 1:
The invention changes the positional parameter of the contact member along the slot region. By adjusting the contact position between the first position (near lower end of slot region) and second position (near upper end of slot region) based on the display expansion state, the system eliminates parasitic resonance while managing complexity through parameter adjustment rather than structural complexity
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
The solution overcomes antenna design space limitations and maintains predetermined antenna performance levels, even as the device changes size, by grounding the current path to suppress parasitic resonance.
Implementation Method 1
parasitic resonance due to the slot region
Implementation Method 2
the slide metal part and the front metal part are in electrical contact with each other by the contact member
Data Source
Figure 1A
Figure 1B
Figure 1C
AI summary
A mobile terminal including an antenna according to an embodiment is provided. The mobile terminal includes a slide metal part and a front metal part, and a contact member configured to contact the slide metal part and the front metal part is provided on a side of the front metal part. In a first state in which a display area of the mobile terminal is contracted, the contact member may remove parasitic resonance caused by a slot area, as the slide metal part and the front metal part contact are contacted by the contact member at a first position which is a lower end of the slot area, and in a second state in which the display area is expanded, the contact member may remove parasitic resonance caused by the slot area, as the slide metal part and the front metal part are contacted by the contact member at a second position which is an upper end of the slot area.