Metal Case Antenna Watch for Dual-Band GPS Reception
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Solution Overview
Problem
Existing watch antennas face challenges in cost reduction and strength enhancement, with complex and costly manufacturing processes, insufficient strength due to plastic materials, and difficulties in meeting ultra-low frequency requirements for GPS reception.
Innovation Solution
The antenna watch incorporates a metal case with a conductor antenna design, where the ground feeding point is disconnected to alter current flow paths, enabling resonance at L1 and L5 frequency bands, and utilizing metal materials for increased strength and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If LDS antenna is used, then antenna function is achieved, but manufacturing process becomes complex and cost increases
Solution Approach 1:
The patent merges the antenna function with the metal case structure itself. The metal case is designed to serve dual purposes: as the structural housing and as the antenna conductor. This eliminates the need for separate antenna components and complex laser engraving processes, thereby simplifying manufacturing while maintaining signal reception quality.
Solution Approach 2:
The metal case is designed to perform multiple functions simultaneously: it serves as the structural enclosure, the aesthetic exterior, and the antenna conductor for GPS signal reception. This multi-functionality reduces the number of components needed and simplifies the manufacturing process while maintaining all required functions.
2Strength
If plastic material is used for watch body, then antenna function is achieved, but overall strength becomes insufficient
Solution Approach 1:
The patent changes the material parameter from plastic to metal for the case. This material substitution fundamentally alters the electrical and mechanical properties: metal provides both the required mechanical strength and the necessary electrical conductivity for antenna operation, eliminating the strength limitations of plastic while maintaining signal reception capability.
3Volume of moving object
If external conductors are added for GPS reception, then signal reception is improved, but device volume increases
Solution Approach 1:
The patent combines the antenna conductor with the existing metal case structure. By utilizing the case itself as the antenna element, there is no need for additional external conductors or separate antenna components. This integration maintains compact device dimensions while ensuring adequate GPS signal reception through the conductive metal case.
4Adaptability or versatility
If ceramic antenna is used, then dual frequency reception is achieved, but metal case cannot be used due to shielding
Solution Approach 1:
Instead of using a ceramic antenna that would prevent metal case usage, the patent inverts the approach by making the metal case itself the antenna. This reversal eliminates the shielding problem entirely, as the conductive metal case is now the functional antenna element rather than an interfering structure. The design achieves both metal construction and multi-frequency reception capability.
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 solution achieves effective radiation and reception of electromagnetic waves at L1 and L5 frequency bands, reduces antenna costs, and enhances the overall strength and durability of the watch body.
Implementation Method 1
the current to form different distribution situations on two sides of the disconnection, guiding the current to be distributed in a way that is conducive to resonance at the wavelength frequency points corresponding to L1 and L5 frequency bands
Data Source
AI summary
An antenna watch is provided, which includes a watch case, a watch cover, a bottom case, and a circuit module. The watch cover is fixedly provided on one side of the watch case, the bottom case is fixedly provided on the other side of the watch case, the circuit module is provided inside the watch case, and a display screen is provided between the watch case and the watch cover; the watch cover includes a first cover and a second cover. The second cover is located between the first cover and the watch case, and both the first cover and the second cover are fixedly connected to the watch case; the second cover is a conductor antenna, made of metal material, and exposed outside the antenna watch. This application has the effect of reducing the cost of receiving antennas and improving the strength of the watch body.