Radio Wave Watch Antenna Ground Layer Segmentation
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Solution Overview
Problem
Conventional radio wave watches have limited antenna reception sensitivity, which affects their ability to accurately receive GPS signals.
Innovation Solution
A radio wave watch design that includes a substrate with a first ground layer and a second ground layer, where the second ground layer is positioned opposite to the emitting electrode and has a width equal to or greater than the short-circuit part, enhancing the symmetricity of the antenna and improving reception sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional antenna structure with a single ground layer is used, then the device complexity is low, but the reception sensitivity is insufficient
Solution Approach 1:
The ground layer is segmented into two distinct parts: a first ground layer positioned at a first position relative to the emitting electrode, and a second ground layer positioned at a second position (opposite side) relative to the emitting electrode. This segmentation allows each ground layer to serve specific functional purposes, improving reception sensitivity while maintaining manageable structural complexity through clear division of functions.
Solution Approach 2:
The antenna structure transitions from a conventional single-plane ground configuration to a three-dimensional arrangement with ground layers positioned at different spatial locations (first position and second position on the opposite side). This dimensional change creates a more symmetric antenna structure that enhances reception sensitivity by improving the symmetry between the antenna and its image antenna.
2Reliability
If the ground layer width is increased to improve symmetricity, then the reception sensitivity improves, but the area occupied on the substrate increases
Solution Approach 1:
Different ground layers are positioned at different locations with different width requirements. The first ground layer and second ground layer can have different dimensions optimized for their respective positions, allowing the antenna structure to achieve symmetricity and improved reception sensitivity without unnecessarily increasing the total area occupied on the substrate.
Data Source
AI summary
A radio wave watch includes: an exterior case; a dial plate disposed within the exterior case; a substrate disposed on a rear side of the dial plate within the exterior case; a first ground layer disposed on the substrate; an antenna that has a planar emitting electrode disposed between a center of the exterior case and an inner wall surface of the exterior case and opposed to the first ground layer, a planar short-circuit part electrically connecting an end part of the emitting electrode to the first ground layer, and a connecting part connecting the emitting electrode to a receiving circuit of the substrate; and a second ground layer disposed on an opposite side to the emission electrode side across the short-circuit part on the substrate and having a width equal to or greater than a width of the short-circuit part.