Loop Antenna Head Reflector Wearable RF Link
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Solution Overview
Problem
Designing a reliable communication link for wearable electronic devices, such as wireless earbuds, that are small and lightweight, while maintaining effective communication reliability and range at typical RF frequencies, is challenging due to size constraints and the need for antennas to cover both ears and remote devices.
Innovation Solution
A wireless wearable electronic device with a printed circuit board assembly and an antenna configuration that includes a loop-shaped or circular antenna with feed points spaced apart, positioned over a ground plane to form a gap, enhancing communication by forming a principal radiation lobe parallel to a plane, allowing for efficient electromagnetic signal transmission and reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the device size is reduced to fit in the ear, then the form factor and comfort are improved, but the antenna performance and communication range deteriorate
Solution Approach 1:
The patent utilizes the user's head as a natural reflector to create a directional radiation pattern. By positioning the antenna in the earbud and leveraging the head's reflective properties, the system transforms the limited space constraint into a directional advantage, focusing communication energy toward the remote device while maintaining a compact form factor.
Solution Approach 2:
The patent introduces the user's head as an intermediary element that reflects and directs electromagnetic waves. This natural reflector serves as a passive component that enhances antenna performance without requiring additional active elements, effectively using the user's anatomy to solve the space-performance tradeoff.
2Length of stationary object
If the antenna size is increased to improve communication range, then the signal strength is improved, but the device weight and form factor worsen
Solution Approach 1:
The patent counteracts the need for a large, heavy antenna by using the user's head as a natural reflector. This passive reflective surface compensates for the limited antenna size, providing enhanced signal directionality and range without adding weight or bulk to the earbud device.
Solution Approach 2:
The user's head serves as an intermediary that amplifies the effective antenna performance. By positioning the antenna to utilize the head's reflective properties, the system achieves extended communication range and improved signal strength without requiring a physically larger or heavier antenna structure.
3Reliability
If multiple ground planes are added to improve antenna radiation pattern, then the communication reliability is improved, but the device complexity and manufacturing difficulty worsen
Solution Approach 1:
The patent extracts the ground plane function from the device structure itself and replaces it with the user's head as a natural reflector. This eliminates the need for complex multi-layer ground plane constructions within the earbud, simplifying manufacturing while achieving the desired directional radiation pattern through the head's reflective properties.
Solution Approach 2:
The user's head acts as an intermediary that provides the reflective surface needed for directional radiation. This natural reflector replaces complex artificial ground plane structures, reducing device complexity and manufacturing difficulty while maintaining or improving communication reliability through enhanced signal directionality.
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 enables reliable communication between wearable devices and remote devices, maintaining a small form factor while ensuring effective radiation patterns for both earpieces and remote devices, enhancing fitness and health data tracking capabilities.
Implementation Method 1
when an electromagnetic radiation signal is provided to the antenna from the transceiver
Data Source
AI summary
Disclosed is a wireless wearable electronic device having an antenna that communicatively couples the wearable electronic device to another wearable electronic device and to a remote, portable device. The antenna is generally shaped like a loop or ring, has a bow with respect to the plane of the loop or ring and operates in conjunction with the ground planes of the printed circuit boards in proximity to the antenna to form a principal omni-directional lobe about the ear of the user and a secondary lobe downwardly directed from the head of the user to communicate with the remote device.