Segmented HMD Chassis Antenna Layout Without RF Switches
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head-mounted devices (HMDs) with multi-band RF antenna configurations face issues of reduced power efficiency, increased size and weight, and higher costs due to the use of active switches and shields, which also affect industrial design.
Innovation Solution
A segmented metal chassis with physically separate RF antennas, each controlled by a distributed RF transceiver, and notch filter circuits that attenuate resonant frequencies, allowing the chassis to function as a common ground plane, eliminating the need for active switches and shields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-piece chassis is used for head mounted display, then structural integrity is maintained, but manufacturing complexity and cost increase due to difficulty in forming large curved surfaces
Solution Approach 1:
The chassis is divided into multiple separate segments (first chassis segment, second chassis segment, third chassis segment) that can be manufactured independently using conventional processes, then assembled together to form the complete head mounted display structure. This segmentation enables easier manufacturing while maintaining the overall structural integrity through proper joining mechanisms.
2Ease of manufacture
If chassis segments are joined with visible seams, then manufacturing ease improves, but aesthetic appearance deteriorates due to visible segmentation lines
Solution Approach 1:
The chassis segments are joined using mechanisms that conceal the segmentation lines and create a unified appearance. The joining structures are designed to be substantially invisible from external views, merging the visual appearance of separate segments into a cohesive whole that resembles a single-formed chassis.
3Reliability
If internal components are tightly secured to prevent movement, then reliability improves, but heat dissipation deteriorates due to restricted airflow
Solution Approach 1:
The chassis structure incorporates localized features such as ridges, grooves, and selectively positioned openings that provide different functions in different regions. Certain areas are designed with enhanced securing features for component stability, while other areas include thermal management features like ventilation openings and heat sinks to facilitate heat dissipation.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
A head-mounted device (HMD) has a segmented metal chassis including a plurality of physically separate radio frequency (RF) antennas corresponding to different head regions. The HMD further includes a plurality of RF transceivers, each electrically connected to a corresponding RF antenna. Each RF transceiver is configured to drive the corresponding RF antenna with a drive signal at a frequency within a resonant frequency band of the corresponding RF antenna and sense a frequency response to the drive signal. The HMD further includes a plurality of notch filter circuits, each electrically connected in series with a corresponding RF antenna. Each notch filter is configured to attenuate signals at frequencies within the resonant frequency band of the corresponding RF antenna and pass signals at frequencies outside of the resonant frequency band, such that the segmented metal chassis functions as a common ground plane.