Reconfigurable Eyewear Antennas for RF Exposure and Signal Quality
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Solution Overview
Problem
Electronic eyewear faces challenges in meeting RF exposure specifications while maintaining flexible wireless communications, particularly due to constrained antenna designs on temple arms leading to reduced signal quality and uneven RF exposure distribution.
Innovation Solution
A multi-mode antenna structure with configurable antenna traces and switches allows for various configurations, enhancing signal strength and distributing RF exposure across the user's head.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed antenna design is used on temple arms, then the device structure is simple, but signal quality is reduced and RF exposure is unevenly distributed
Solution Approach 1:
The patent implements a reconfigurable antenna system that can dynamically switch between multiple operational modes (single-antenna mode, dual-antenna mode, MIMO mode) based on communication requirements. The antenna structure includes switching mechanisms that allow real-time reconfiguration of antenna elements, transforming a static design into a dynamic one that adapts to different signal quality requirements while managing complexity through controlled reconfigurability.
Solution Approach 2:
The antenna system is designed to perform multiple functions through a single unified structure. The same physical antenna elements can operate in different configurations (single antenna, dual antenna, MIMO) to serve various communication needs. This multi-functionality allows the system to maintain signal quality across different scenarios without requiring entirely separate antenna systems for each mode.
2Object-affected harmful factors
If multiple antenna configurations are implemented, then RF exposure is better distributed, but the switching mechanism increases device complexity
Solution Approach 1:
The switching mechanism is designed to dynamically reconfigure antenna elements based on real-time communication needs and RF exposure considerations. The system can transition between different antenna configurations (single-antenna mode with centralized RF exposure, dual-antenna mode with distributed exposure, MIMO mode with optimized distribution) to balance RF exposure distribution against the complexity of the switching control required.
3Reliability
If antenna traces are constrained on temple arms, then the eyewear form factor is maintained, but wireless communication performance is reduced
Solution Approach 1:
The antenna system divides the limited temple arm space into multiple segments, placing multiple antenna elements (first antenna, second antenna) at different locations along the temple arms. This segmentation allows the system to overcome the length constraint by distributing antenna elements strategically, enabling multiple antenna modes and improving wireless communication performance while maintaining the compact eyewear form factor.
Data Source
AI summary
Certain aspects of the present disclosure provide eyewear having a multi-mode antenna structure. Example eyewear comprises a frame comprising a multi-mode antenna structure comprising antenna traces comprising a first antenna trace and a second antenna trace, a set of switches comprising a first switch and a second switch, wherein each switch of the switches is coupled to at least one of the antenna traces, and wherein the switches is configured to selectively switch among switching states, each of the switching states being associated with a corresponding antenna configuration of a plurality of antenna configurations formed by the antenna traces; a first antenna feed selectively coupled to the first antenna trace via the first switch; and a second antenna feed selectively coupled to the second antenna trace via the second switch. The frame further comprises one or more temple arms coupled to the frame.