Switchable Multi-Band Bezel Antenna for GNSS Accuracy and Power
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Solution Overview
Problem
Wrist-worn electronic devices experience reduced accuracy in geolocation determination due to multipath interference from reflections off large flat surfaces when using global navigation satellite system (GNSS) signals.
Innovation Solution
A wrist-worn electronic device with a multiple mode, multiple frequency band antenna configuration that can selectively switch between dual band and single band modes, utilizing a bezel with apertures tuned by adjustable aperture tuning networks to improve signal reception and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the electronic device receives and processes multiple frequency band signals in dual band mode, then geolocation accuracy is improved, but power consumption increases
Solution Approach 1:
The antenna system dynamically switches between dual band mode and single band mode based on operational requirements. The aperture tuning network adjusts the antenna configuration to receive both L1 and L5 frequency bands when high accuracy is needed, and switches to single band operation when power conservation is prioritized, making the system adaptable to different power and accuracy requirements
2Measurement precision
If the antenna receives GNSS signals directly, then geolocation accuracy is improved, but multipath interference from reflections decreases signal quality
Solution Approach 1:
The aperture tuning network changes the electrical parameters of the antenna by adjusting which frequency bands are received and processed. By selectively tuning the antenna to specific frequency bands (L1, L5, or both), the system optimizes signal reception characteristics and mitigates multipath interference effects that vary across different frequency bands
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
Enhances geolocation accuracy by processing multiple frequency band signals in dual band mode and conserves power by switching to single band mode, while maintaining effective signal reception and reducing interference.
Implementation Method 1
the first aperture receives a first global navigation satellite system (GNSS) wireless signal at a first frequency band and is formed by a first portion of a circumference of the bezel, and the second aperture receives a second GNSS wireless signal at a second frequency band
Data Source
AI summary
A wrist-worn electronic device comprises a bezel, an antenna, and an aperture tuning network. The bezel is formed at least partially from electrically conductive material and positioned along a side wall of a housing of the device. The antenna includes a first aperture and a second aperture which are formed by various portions of the bezel. The antenna is configured to operate in one of two operating modes including a dual band mode in which the first aperture receives a first global navigation satellite system (GNSS) wireless signal at a first frequency band and the second aperture receives a second GNSS wireless signal at a second frequency band, and a single band mode in which the first aperture and the second aperture each receive the first GNSS wireless signal. The aperture tuning network has an adjustable configuration wherein adjustment of the adjustable configuration changes the operating mode of the antenna.