Conductive Gasket Antenna Layout for Compact Wrist Navigation
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Solution Overview
Problem
Wrist-worn training computers face challenges in achieving good performance while maintaining a reasonable size and weight due to large and heavy antenna arrangements, which can be uncomfortable to wear and are prone to damage from harsh conditions.
Innovation Solution
Incorporating a gasket with electrically conductive material as the second part of the satellite navigation receiver antenna to improve radiation characteristics without increasing size, combined with a folded dipole antenna configuration and strategic positioning to enhance RHCP gain and reduce LHCP gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large antenna arrangement is used for satellite navigation receiver, then antenna performance is improved, but device weight increases
Solution Approach 1:
The gasket, which is already present in the wrist device for sealing purposes, is combined with antenna functionality by incorporating electrically conductive material into it. This merging of sealing and antenna functions eliminates the need for separate antenna components, thereby improving antenna performance without increasing device weight.
Solution Approach 2:
The gasket is designed to serve multiple functions simultaneously: it provides sealing between the display lens and casing, and also functions as part of the antenna system for satellite navigation reception. This multi-functionality allows the same component to contribute to both device protection and signal reception performance.
2Reliability
If a large antenna arrangement is used for satellite navigation receiver, then antenna performance is improved, but device size increases
Solution Approach 1:
The antenna structure is merged with the existing gasket component, allowing the antenna elements to be positioned within or integrated into the gasket's structure. This eliminates the need for additional space dedicated solely to antenna components, maintaining compact device size while achieving good antenna performance.
Solution Approach 2:
The antenna elements are arranged in specific spatial configurations (such as folded dipole arrangements) that optimize radiation characteristics without requiring increased device volume. The use of three-dimensional positioning and folding techniques allows efficient use of available space within the wrist device.
3Reliability
If additional protective components are included, then device durability is improved, but device size and weight increase
Solution Approach 1:
The gasket serves dual purposes: it provides protective sealing between the display lens and casing to improve device durability, and simultaneously functions as part of the antenna system. This merging eliminates the need for separate protective components that would add weight, achieving both protection and antenna performance with the same component.
4Reliability
If additional protective components are included, then device durability is improved, but device size increases
Solution Approach 1:
The protective gasket and antenna structure are merged into a single integrated component. The gasket provides necessary protection and sealing while its electrically conductive material forms part of the antenna, eliminating the need for additional protective components that would increase device size.
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 enhances antenna performance by improving RHCP gain and reducing LHCP gain, ensuring effective navigation signal reception while maintaining a compact and durable design.
Implementation Method 1
a gasket positioned along the interface between the display lens and the casing to seal the enclosed space, wherein the gasket comprises electrically conductive material that forms a second part of the antenna
Implementation Method 2
folded dipole antenna configuration and strategic positioning to enhance RHCP gain and reduce LHCP gain
Data Source
AI summary
A wrist-worn training computer includes one or more biosensors; a casing; a display lens positioned against the casing to form an interface between the display lens and the casing, and to enclose together with the casing an enclosed space between the casing and the display lens; a first part of an antenna of a satellite navigation receiver disposed within the enclosed space; and a gasket positioned along the interface between the display lens and the casing to seal the enclosed space. The gasket comprises electrically conductive material that forms a second part of the antenna.