Bezel Antenna System for Multi-Frequency GNSS
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Solution Overview
Problem
Current wrist-worn electronic devices using single frequency band antennas for location determination, such as GPS L1 band, face limitations in accuracy compared to using multiple frequency bands, which can improve geolocation precision but are not effectively integrated into a compact wrist-worn design.
Innovation Solution
A wrist-worn electronic device with a bezel-formed multiple frequency band antenna configuration, incorporating both GPS L1 and L5 band antennas, enhances geolocation accuracy by utilizing the bezel's conductive material to form radiating elements for each frequency band, allowing simultaneous reception and processing of signals from multiple satellite systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single frequency band antenna is used in the wrist-worn device, then the device complexity is reduced and manufacturing is simplified, but the geolocation determination accuracy deteriorates
Solution Approach 1:
The patent combines multiple frequency band antenna functions into a single integrated bezel structure. The bezel serves as a common platform that supports both L1 and L5 frequency band antenna elements, merging what would traditionally be separate antenna components into one unified structure. This reduces the overall number of discrete parts while maintaining multi-frequency reception capability, thereby improving geolocation accuracy without proportionally increasing device complexity
Solution Approach 2:
The bezel is designed to perform multiple functions: it serves as both a structural frame component and as the radiating element for multiple frequency band antennas. By making the bezel electrically conductive and configuring it with multiple antenna elements, it simultaneously supports L1 band GPS reception, L5 band GPS reception, and potentially other satellite systems, allowing one component to fulfill multiple antenna functions that would otherwise require separate dedicated components
2Measurement precision
If multiple frequency band antennas are integrated into the bezel, then geolocation accuracy is improved, but the manufacturing process becomes more complex
Solution Approach 1:
The manufacturing process benefits from merging multiple antenna functions into the single bezel component. Rather than assembling multiple separate antenna elements and their supporting structures, the bezel is manufactured as one piece with integrated antenna elements. This can be achieved through processes like injection molding with conductive materials or by attaching conductive traces during bezel fabrication, simplifying the overall manufacturing workflow despite the multi-frequency capability
Solution Approach 2:
The bezel incorporates electrically conductive materials to enable antenna functionality. This may involve using conductive polymers, metal-infused plastics, or composite structures with conductive layers. By integrating the conductive properties directly into the bezel material rather than adding separate conductive components, the manufacturing process maintains relative simplicity while achieving the electrical characteristics needed for multi-frequency antenna operation
3Volume of moving object
If the bezel is used as a radiating element for multiple frequency bands, then the device maintains a compact wearable design, but the antenna isolation between frequency bands becomes challenging
Solution Approach 1:
The bezel antenna system is segmented into distinct radiating elements or zones, each optimized for specific frequency bands. By dividing the continuous bezel structure into functionally separated antenna elements (such as different arcs or segments of the bezel), the design maintains compact form factor while reducing mutual interference between L1 and L5 band signals. Electrical isolation techniques like grounding segments or using non-conductive spacers between elements can further enhance signal separation
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 multi-frequency band antenna configuration significantly improves the accuracy of geolocation determination, enabling more precise tracking of user location, distance, and performance metrics while maintaining a compact and wearable design.
Implementation Method 1
The first frequency band antenna includes a radiating element formed by a first portion of a circumference of the bezel. The second frequency band antenna includes a radiating element formed by a second portion of the circumference of the bezel.
Data Source
AI summary
A wrist-worn electronic device comprises a housing, a bezel, a location determining element, a communication element, and four antennas. The housing includes a bottom wall contacting a wearer's wrist and a side wall coupled to the bottom wall. The bezel is formed at least partially from electrically conductive material and positioned along an upper edge of the side wall. Two antennas receive a first global navigation satellite system (GNSS) location signals at a first frequency and a second frequency that are used by the location determining element, each antenna including a radiating element formed by a portion of the circumference of the bezel. Two antennas transmit or receive communication protocol wireless signals at a third frequency and a fourth frequency output by or communicated to the communication element, each antenna including a radiating element formed by a portion of the circumference of the bezel.