Wearable Antenna Efficiency via Angled Ground Connection
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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, especially when mounted on the wrist or other body parts, as conventional methods like monopole and patch antennas struggle with human body interference and miniaturization.
Innovation Solution
A wearable device design incorporating a metal housing with a metal structure and display, where the metal layer is electrically connected to a printed circuit board's ground area at a specific angle, forming a conductive path to enhance antenna efficiency and directivity, and allowing for adjustable radiation patterns based on user conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a monopole antenna is mounted within a strap, then the antenna can be integrated into the wearable device, but radiation performance is considerably reduced due to human body interference
Solution Approach 1:
The patent introduces a matching circuit as an intermediary component between the monopole antenna and the GPS receiver. This matching circuit includes inductors and capacitors that act as mediators to compensate for the deteriorated radiation performance caused by human body interference, thereby improving signal reception without changing the antenna's physical mounting location.
Solution Approach 2:
The patent modifies the electrical parameters of the antenna system by adding reactive components (inductors L1-L4 and capacitors C1-C4) that change the impedance characteristics and resonant frequency of the antenna. These parameter changes compensate for the performance degradation caused by the human body's proximity to the antenna.
2Reliability
If a patch antenna is used, then antenna efficiency and directivity are excellent, but it occupies a lot of volume making it difficult to apply to recent smart watches
Solution Approach 1:
The patent combines the monopole antenna structure with a matching circuit that integrates multiple functional elements (inductors, capacitors, and grounding structures) into a compact arrangement. This merging allows the system to achieve patch-antenna-like efficiency while maintaining the space-saving advantages of the monopole configuration.
Solution Approach 2:
The patent utilizes the third dimension by extending the antenna structure vertically with multiple ground layers and stacking inductors and capacitors in layered configurations. This dimensional approach allows compact integration of the matching circuit components without increasing the planar footprint, thereby maintaining small form factor while improving efficiency.
3Ease of manufacture
If coupling feeding is used, then the antenna can be implemented with existing metal structures, but it is difficult to improve efficiency and miniaturize the antenna due to limited space for coupling structure
Solution Approach 1:
The patent introduces a matching circuit as an intermediary that mediates between the simple monopole antenna structure and the GPS receiver. This matching circuit compensates for the inefficiencies of coupling feeding by providing impedance transformation and resonance tuning, thereby improving antenna efficiency without requiring complex coupling structures.
Solution Approach 2:
The patent segments the antenna system into distinct functional modules: the monopole radiating element, the matching circuit with separate inductor and capacitor components, and the grounding structure. This segmentation allows each component to be optimized independently and facilitates compact integration while maintaining ease of manufacture.
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 design achieves high antenna efficiency and directivity, improving user experience by optimizing radiation patterns and signal reception, even when worn on the wrist or other body parts, while minimizing interference from the human body.
Implementation Method 1
the metal layer is electrically connected with the ground area of the PCB at a second point spaced apart by an angle with respect to the first point
Data Source
AI summary
A wearable device mountable on a user's wrist is provided. The wearable device includes a housing having a metal structure, a display disposed in the housing and including a metal layer, the metal layer being disposed so as to be surrounded by the metal structure and to be spaced apart by a gap, a printed circuit board (PCB) disposed in the housing and including a ground area, and a control circuit disposed on the PCB and feeding a first point of the metal structure. Here, the metal layer is electrically connected with the ground area of the PCB at a second point spaced apart by an angle with respect to the first point.