Wearable Antenna Using Housing Coupling for Wrist Radiation Efficiency
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Solution Overview
Problem
Wearable electronic devices face challenges in mounting multiple antennas due to limited space, leading to reduced radiation performance and efficiency, particularly when mounted on the wrist or other body parts, where existing antennas like monopole or patch antennas are either obstructed by the human body or occupy too much space.
Innovation Solution
A wearable device antenna design utilizing a metal structure integrated into the display and housing, allowing for high efficiency and directivity by adjusting the radiation pattern based on operating conditions, and using a coupling effect to connect the metal structure with the ground region for improved radiation efficiency across various frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a monopole antenna is mounted within a strap, then the antenna structure is simple and compact, but the radiation performance is greatly reduced by the human body
Solution Approach 1:
The patent merges the antenna structure with the housing metal structure, specifically using the side surface of the housing as part of the antenna radiator. This integration allows the antenna to leverage the housing's structural properties while maintaining compact form factor, resolving the contradiction between small size and radiation performance.
Solution Approach 2:
The patent introduces a coupling structure that mediates between the antenna feed and the housing metal structure. This coupling mechanism enables efficient energy transfer to the housing-based radiator, improving radiation performance without requiring a separate traditional antenna element that would occupy additional space.
2Reliability
If a patch antenna is used, then the efficiency and directivity are excellent, but the antenna occupies much space
Solution Approach 1:
The patent combines the functions of the housing structure and the antenna radiator into a single integrated component. The side surface of the housing serves dual purposes as both structural support and radiating element, achieving patch antenna-level efficiency without the space requirements of a traditional patch antenna design.
Solution Approach 2:
The housing metal structure serves multiple functions: it provides mechanical support, electromagnetic shielding, and acts as the antenna radiator. This multi-functionality eliminates the need for separate antenna components, reducing overall device volume while maintaining excellent radiation efficiency.
3Ease of operation
If coupling feeding is used, then indirect feeding is achieved, but it is difficult to miniaturize the antenna and improve efficiency
Solution Approach 1:
The patent employs a carefully designed coupling structure that acts as an intermediary between the feed point and the housing-based radiator. This coupling mechanism is optimized to maximize energy transfer efficiency, overcoming the typical efficiency losses associated with indirect feeding arrangements.
Solution Approach 2:
The patent optimizes key parameters of the coupling structure, including its geometry, position, and electrical characteristics, to achieve efficient energy transfer. By carefully adjusting these parameters, the design achieves high radiation efficiency despite using indirect coupling feeding, while maintaining a compact form factor.
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 enables high-efficiency and directional antenna performance in wearable devices, minimizing space requirements and improving user experience by dynamically adjusting the antenna's radiation pattern and resonance frequency, thus enhancing communication capabilities such as GPS, Bluetooth, and Wi-Fi without the need for additional antennas.
Implementation Method 1
using a coupling effect to connect the metal structure with the ground region for improved radiation efficiency
Implementation Method 2
allowing for high efficiency and directivity by adjusting the radiation pattern based on operating conditions
Data Source
Figure 1
Figure 2~3a
Figure 3b~4a
AI summary
A wearable device which is mountable on a wrist of a user includes a housing including a metal structure, a display positioned within the housing, wherein the display includes a metal layer positioned within the metal structure and spaced apart from the metal structure by a given gap, a printed circuit board (PCB) positioned within the housing and including a ground region, and a control circuit positioned on the PCB and configured to feed a first point of the metal structure. The metal layer is electrically connected with the ground region of the PCB at a second point spaced from the first point by a given angle.