Smart Glasses Antenna Layout for Multi-Band Isolation
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Solution Overview
Problem
Designing efficient and isolated antenna systems for wearable devices like smart glasses is challenging due to space, weight, and thermal constraints, as well as the need for high radiation efficiency across multiple cellular frequency bands, which existing technologies fail to adequately address.
Innovation Solution
The implementation of a hybrid antenna system comprising loop and non-loop antennas, such as loop antennas around one lens and loaded monopole antennas around another, integrated into the frame and temple of eyewear devices, with each antenna optimized for specific frequency bands and positioned to minimize correlation and maximize radiation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antenna elements are integrated into wearable devices to support cellular communication, then cellular communication capability is improved, but antenna isolation and radiation efficiency deteriorate due to limited space and electrical smallness
Solution Approach 1:
The patent divides the antenna system into multiple independent antenna elements (first antenna element, second antenna element, third antenna element) that are spatially separated and electrically isolated from each other. Each element is designed to operate on different frequency bands, allowing simultaneous operation with minimal correlation. This segmentation enables wearable devices to support multiple cellular frequency bands while maintaining adequate isolation between elements despite the limited form factor.
Solution Approach 2:
The patent utilizes three-dimensional spatial arrangement of antenna elements within the wearable device structure. By positioning antenna elements at different locations and orientations in 3D space, the design achieves electrical isolation and reduces mutual coupling effects. This dimensional approach allows the system to overcome the two-dimensional space constraints of wearable devices and achieve adequate antenna performance.
2Volume of moving object
If antenna elements are made electrically small to fit wearable devices, then device compactness is improved, but radiation efficiency deteriorates
Solution Approach 1:
The patent applies different design optimizations to different antenna elements based on their specific operating characteristics and frequency band requirements. Each antenna element is locally optimized for its designated function, allowing the system to achieve good radiation efficiency across multiple bands despite the overall compact size. This localized optimization enables each element to maximize its radiation performance within the constraints of the wearable form factor.
3Adaptability or versatility
If multiple antenna elements operate simultaneously on different frequency bands, then cellular coverage is improved, but mutual interference and correlation increase
Solution Approach 1:
The patent assigns different frequency band operations to different antenna elements, with each element optimized for specific bands. This segmentation of frequency band allocation reduces mutual interference by ensuring that simultaneously active elements operate on sufficiently separated frequencies, minimizing correlation effects while maintaining comprehensive cellular coverage across multiple 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
This configuration enhances cellular signal reception and radiation efficiency while maintaining isolation between antennas, ensuring compliance with regulatory metrics like SAR and supporting advanced cellular communication functions in wearable devices.
Implementation Method 1
These antenna elements should be capable of simultaneous operation with high radiation efficiency on wide and far apart frequency bands
Data Source
AI summary
Examples include a wearable device having a frame, a temple and onboard electronics components. The frame can optionally configured to hold one or more optical elements. T temple can optionally connected to the frame at a joint such that the temple is disposable between a collapsed condition and a wearable condition in which the wearable device is wearable by a user to hold the one or more optical elements within user view. The onboard electronics components can be carried by at least one of the frame and the temple and can include a first antenna configured for cellular communication carried by the frame and a second antenna configured for cellular communication carried by one of the frame or the temple.