Wearable Antenna Isolation via Stacked Structures
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Solution Overview
Problem
Smart watches face challenges in incorporating cellular communication infrastructure due to size constraints and the difficulty of resonating cellular signals at multiple bands within an all-metal housing, as well as the complexity of isolating multiple antennas in wearable devices.
Innovation Solution
The use of a bezel and back plate as antennas, insulated from the watch body using misaligned contacts on separate structures, such as printed circuit boards, allows for cellular signals to resonate at multiple bands with improved performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple antennas are incorporated in a wearable device, then long-range cellular communication capability is improved, but device complexity and difficulty of isolation between antennas increases
Solution Approach 1:
The wearable device is divided into multiple structural layers: a first structure containing first electronic components and a first antenna, and a second structure containing second electronic components and a second antenna. This segmentation physically separates the antennas and their supporting structures, enabling proper isolation while maintaining multiple cellular communication bands in the compact wearable form factor.
2Strength
If cellular antennas are placed in an all-metal housing, then structural integrity and aesthetics are improved, but signal resonance at multiple bands deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional planar antenna layout to a three-dimensional stacked configuration with vertical separation between structures. The first and second structures are positioned at different heights within the housing, with the second structure beneath and spaced from the first structure. This vertical dimensionality enables multi-band resonance while maintaining the all-metal housing's structural integrity and aesthetic appearance.
3Volume of moving object
If device size is reduced for wearable comfort, then wearability is improved, but antenna performance and isolation deteriorate
Solution Approach 1:
The patent implements a nested configuration where the second structure containing the second antenna is positioned beneath and integrated within the overall device footprint defined by the first structure. The misaligned contacts and spaced arrangement allow the smaller second structure to be nested under the first structure, enabling both antennas to achieve proper performance and isolation within the compact wearable device volume.
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 enables efficient multi-band cellular communication in wearable devices by effectively isolating and exciting the antennas, reducing interference and enhancing performance, particularly in small form factor devices like smart watches.
Implementation Method 1
One or more of such structural features may, in turn, afford antennas that allow cellular signals to resonate at multiple bands with sufficient performance characteristics
Data Source
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AI summary
An apparatus and method are provided for a wearable article with multiple antennas. The wearable article includes a body, a first structure positioned in the body, and a plurality of first electronic components mounted on the first structure. Further included is a second structure positioned in the body beneath and spaced from the first structure, and a plurality of second electronic components mounted on the second structure. A first antenna is in electrical communication with at least one of the first electronic components, and a second antenna is in electrical communication with at least one of the second electronic components.