Wearable Antenna Structure for Multi-Band Communication in Limited Space
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Solution Overview
Problem
Wearable devices, such as smart watches, lack sufficient internal space to accommodate antennas for wireless communication, posing a challenge for antenna designers.
Innovation Solution
A wearable device with a feeding radiation element, connection radiation element, bifurcate radiation element, shorting radiation element, and extension radiation element, all disposed on a carrier element, forming an integrated antenna structure that covers multiple frequency bands, including 2G, 3G, LTE, and Wi-Fi frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antennas are used in wearable devices, then wireless communication function is achieved, but the device size increases beyond acceptable limits
Solution Approach 1:
The antenna is divided into multiple independent radiation elements (feeding radiation element, connection radiation element, bifurcate radiation element, shorting radiation element, extension radiation element) that are distributed across different regions of the watch frame. This segmentation allows each element to contribute to different frequency bands while maintaining a compact overall structure that fits within wearable device constraints.
Solution Approach 2:
The antenna structure utilizes the two-dimensional surface of the watch frame carrier element to accommodate multiple radiation elements. By arranging elements in specific spatial configurations (some on the same side, some on opposite sides) rather than stacking them linearly, the design achieves multi-frequency functionality without increasing the device's volume beyond the watch frame boundaries.
2Adaptability or versatility
If multiple frequency bands are supported, then communication versatility is improved, but antenna structure complexity increases
Solution Approach 1:
Each radiation element is designed to serve multiple frequency bands simultaneously. For example, the feeding radiation element with its specific length and configuration supports both LTE bands (741-782 MHz and 1710-2155 MHz) and Wi-Fi bands. The bifurcate radiation element with its branching structure contributes to multiple frequency operations. This multi-functionality approach allows the antenna system to cover diverse communication standards without requiring separate dedicated antennas for each frequency band.
Solution Approach 2:
Multiple radiation elements are electrically connected through the connection radiation element and grounding structures to form an integrated antenna system. The feeding radiation element, bifurcate radiation element, and extension radiation element are combined through controlled impedance connections and shared ground references, creating a unified structure that operates across multiple frequency bands with coordinated radiation patterns.
3Volume of moving object
If antenna size is reduced, then device compactness is improved, but bandwidth coverage is limited
Solution Approach 1:
The radiation elements incorporate curved and meandering geometries rather than simple straight lines. The bifurcate radiation element features branching paths, the shorting radiation element has a meandering shape, and the extension radiation element extends with specific curvature. These curved and complex two-dimensional paths increase the effective electrical length of each element within a compact physical footprint, enabling resonance at multiple frequency bands while maintaining small overall antenna dimensions.
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 integrated antenna structure enables efficient wireless communication across multiple frequency bands while minimizing device size and manufacturing costs, suitable for small-size wearable devices.
Implementation Method 1
a wearable device and an antenna structure therein... feeding radiation element, a connection radiation element, a bifurcate radiation element, a shorting radiation element, an extension radiation element... The antenna structure covers a first frequency band and a second frequency band
Data Source
AI summary
A wearable device includes a feeding radiation element, a connection radiation element, a bifurcate radiation element, a shorting radiation element, an extension radiation element, and a carrier element. The feeding radiation element has a feeding point. The connection radiation element is coupled to the feeding radiation element. The bifurcate radiation element is coupled to the connection radiation element. The connection radiation element is also coupled through the shorting radiation element to a grounding point. The extension radiation element is coupled to the feeding radiation element. The feeding radiation element, the connection radiation element, the bifurcate radiation element, the shorting radiation element, and the extension radiation element are disposed on the carrier element. An antenna structure is formed by the feeding radiation element, the connection radiation element, the bifurcate radiation element, the shorting radiation element, and the extension radiation element.