Slot-Ring Eyewear Antenna for Compact Multi-Band Wireless
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Solution Overview
Problem
Existing wearable augmented reality devices face challenges in integrating efficient wireless communication systems due to space and weight constraints, while also needing to comply with safety regulations such as specific absorption rate (SAR).
Innovation Solution
The integration of a slot-ring antenna design into the eyewear device, which generates E-fields that are orthogonal to each other, allowing for efficient wireless communication while minimizing space and weight. This design reuses existing volumes within the device, such as the optical waveguide frame, to accommodate the antenna.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antenna designs are integrated into wearable augmented reality devices, then wireless communication functionality is achieved, but the device weight and volume increase significantly
Solution Approach 1:
The patent merges the antenna structure with the optical waveguide frame by integrating the antenna into the existing frame volume. The antenna is positioned within the frame structure, utilizing the same physical space that would otherwise be empty or used for structural support, thereby eliminating the need for separate antenna components and reducing overall device weight.
Solution Approach 2:
The optical waveguide frame serves dual functions: it provides the structural framework for the optical system and simultaneously houses the antenna for wireless communication. This multi-functional design allows a single component to fulfill multiple roles, reducing the total number of parts and minimizing weight while maintaining both optical and communication functionalities.
2Adaptability or versatility
If multiple antennas are integrated into compact wearable devices, then support for multiple frequency bands is achieved, but antenna coupling increases and efficiency decreases
Solution Approach 1:
The patent implements orthogonal polarization between multiple antennas, segmenting the electromagnetic field space into independent polarization domains. This orthogonal configuration ensures that antennas operating at different orientations do not interfere with each other, minimizing coupling effects and maintaining high efficiency across multiple frequency bands simultaneously.
3Volume of moving object
If antenna volume is reduced to meet wearable device constraints, then device compactness is improved, but wireless communication performance deteriorates
Solution Approach 1:
The patent transitions the antenna design from conventional planar configurations to three-dimensional orthogonal structures that utilize spatial dimensions more efficiently. By employing orthogonal polarizations in three-dimensional space, the antenna achieves full wireless communication performance within a significantly reduced volume, making it suitable for compact wearable devices.
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 slot-ring antenna design enables high-speed wireless connectivity with minimal coupling between antennas, supporting multiple frequency bands and maintaining efficiency even when integrated into compact wearable devices.
Implementation Method 1
The slot ring antenna has a first portion including an inner ring and an outer ring configured to generate a first E-field in a first direction, and a second portion having a respective inner ring and the outer ring configured to generate a second E-field in a second direction that is orthogonal to the first direction
Data Source
AI summary
Eyewear with a slot ring antenna generating orthogonal E-fields. The slot ring antenna has a first portion including an inner ring and an outer ring generating a first direction E-field, and a second portion having a respective inner ring and the outer ring generating a second direction E-field. The outer ring encompasses the respective inner rings, where a first slot is defined between the respective inner ring and the outer ring. A second slot is encompassed by the respective inner ring, which may be a cutout. The slot ring antenna encompasses eyewear optical assemblies. In one example, the first portion encompasses a first optical assembly, and the second portion encompasses a second optical assembly. A common ground plane of the outer ring may extend proximate a bridge of the eyewear.