AR Glasses Loop Antenna Layout for Lower SAR and Better Radiation
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Solution Overview
Problem
Wearable electronic devices, such as AR glasses, face challenges in maintaining antenna performance due to reduced mounting space and increased specific absorption rate (SAR) when the antenna is disposed in temples, leading to degraded wireless communication.
Innovation Solution
The wearable electronic device incorporates an antenna disposed between the first glass and the first rim, in a bridge, and between the second glass and the second rim, utilizing a conductive pattern and a conductive stub to form a loop antenna, which enhances radiation efficiency and reduces SAR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the antenna is disposed in the temples to reduce device weight, then weight is reduced, but mounting space for the antenna is reduced and SAR increases
Solution Approach 1:
The antenna configuration transitions from a traditional temple-mounted position to a multi-dimensional arrangement spanning the bridge and rim structures. The conductive pattern extends across multiple structural elements (first rim, bridge, second rim) creating a three-dimensional antenna layout that utilizes available space more effectively while maintaining weight reduction benefits
2Weight of moving object
If the antenna is disposed in the temples, then device weight is reduced, but SAR to the body is increased
Solution Approach 1:
The antenna function is extracted from the temple components and redistributed across the bridge and rim structures. This separation removes the antenna from direct contact with the body (reducing SAR) while maintaining the lightweight design through strategic placement in non-contact areas
3Weight of moving object
If the antenna is disposed in the temples, then device weight is reduced, but wireless communication performance is degraded
Solution Approach 1:
The antenna structure merges multiple conductive elements (first conductive pattern in first rim, second conductive pattern in second rim, third conductive pattern in bridge) into a unified radio frequency circuit. This combined configuration maintains lightweight construction while improving wireless communication reliability through enhanced signal paths and radiation characteristics
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 configuration effectively reduces the SAR of the antenna for the body, prevents degradation of antenna performance, and optimally allocates mounting space for the antenna, resulting in improved wireless communication efficiency.
Implementation Method 1
a first antenna including a conductive pattern formed thereon disposed in at least a part of the first rim, the bridge, and the second rim
Implementation Method 2
a conductive pattern disposed in at least a part of the first rim, the bridge, and the second rim... a first part electrically connected to the feed part and extending through the first rim, the bridge, the second rim, and the first rim
Data Source
AI summary
A wearable electronic device is disclosed, including: a bridge; a first and second rim; a first and second glass; a first and second temple that are foldable, a first printed circuit substrate within the first temple and including a wireless communication module; an flexible printed circuit substrate electrically connected to the first PCB, disposed in the first rim, the bridge, and the second rim, and including a feed part and a ground; a conductive pattern disposed in the first rim, the bridge, and the second rim; and a conductive stub electrically connected to the conductive pattern, wherein the conductive pattern includes a first part electrically connected to the feed part and extending through the first rim, the bridge, the second rim, and the first rim, and a second part electrically connected to the ground, wherein the conductive stub includes a first part electrically connected to the feed part.