Antenna Pattern on Metallic Side Wall for Wearable Isolation
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Solution Overview
Problem
Small-sized wearable electronic devices with full-metal body designs face challenges in antenna installation due to spatial constraints, leading to poor isolation between multiple antennas and reduced signal sending and receiving efficacy.
Innovation Solution
The design incorporates a middle frame, metallic side walls, dielectric elements, and antenna wiring circuits with specific patterns to achieve electrical isolation and resonant frequency bands, allowing multiple antennas to be efficiently placed and operate effectively within the limited space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are disposed in the small-sized wearable electronic device, then the wireless communication function is improved, but the isolation between antennas deteriorates
Solution Approach 1:
The patent utilizes the side wall surface of the wearable device as a three-dimensional space for antenna placement. By forming antenna patterns on the side wall rather than using traditional planar ground surfaces, the invention creates additional spatial dimensions for antenna arrangement, enabling multiple antennas to be disposed with adequate separation for proper isolation while maintaining compact device dimensions.
Solution Approach 2:
The patent introduces a dielectric element positioned between the antenna pattern and the metallic side wall. This dielectric intermediary serves multiple functions: it provides electrical isolation between the antenna and conductive side wall, enables proper resonance characteristics, and facilitates ground contact through the metallic side wall while maintaining antenna performance. This intermediary structure resolves the conflict between utilizing metallic bodies and achieving proper antenna isolation.
2Shape
If full-metal body design is used, then the product appearance is improved, but the antenna installation difficulty increases
Solution Approach 1:
The invention moves antenna placement from traditional internal planar surfaces to the external side wall surface. By forming antenna patterns on the side wall using conductive materials or conductive ink, the patent enables full-metal body construction while providing dedicated spaces for antenna installation that do not interfere with the metallic aesthetic or structural integrity of the device.
Solution Approach 2:
The dielectric element acts as an intermediary layer between the metallic side wall and the antenna pattern. This dielectric barrier allows the side wall to maintain its full-metal construction and appearance while preventing direct electrical contact that would short-circuit the antenna. The dielectric enables the antenna to resonate properly with the metallic side wall serving as a ground reference without compromising the metallic body design.
3Volume of moving object
If the ground contact area is reduced, then the device size is improved, but the signal sending and receiving efficacy deteriorates
Solution Approach 1:
The patent transforms the ground contact function from requiring large planar area on the device bottom to utilizing the vertical side wall surface. By forming antenna patterns that extend along the side wall and using the side wall itself as a ground reference, the invention achieves adequate ground contact area within the limited device footprint, maintaining signal efficacy without increasing device size.
Solution Approach 2:
The metallic side wall serves multiple functions simultaneously: it provides the structural frame of the device, maintains the full-metal aesthetic appearance, and acts as the ground reference for antenna operation. The dielectric element with antenna pattern on the side wall enables the side wall to function as both structural component and electromagnetic reference plane, eliminating the need for separate large ground contact areas.
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 configuration enhances the flexibility of using interior space, maintains good signal sending and receiving qualities, and ensures effective operation of multiple antennas in wearable electronic devices with metallic bodies, even under spatial constraints.
Implementation Method 1
The first dielectric element is disposed at the first slot and electrically isolates the first metallic side wall and the middle frame
Implementation Method 2
The first metallic side wall is coupled to and resonant with the first metal portion and the second metal portion to generate a first resonant frequency band
Data Source
AI summary
A wearable electronic device includes a middle frame, a metallic side wall, a dielectric element, and a antenna wiring circuit. The metallic side wall is disposed at one side of the middle frame and has a slot. The dielectric element is disposed at the slot and electrically isolates the metallic side wall and the middle frame. The antenna wiring circuit is disposed at the dielectric element and comprises a antenna pattern. The antenna pattern comprises first and second metal portions. The first metal portion comprises a slit surrounded by first to third segments. The first segment has a signal feeding terminal. The second metal portion is connected to the third segment and is located in the slit. The metallic side wall performs coupled resonant with the first metal portion and the second metal portion to generate a resonant frequency band.