Stacked Antenna Elements for Wearable Device Miniaturization
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Solution Overview
Problem
The challenge is to effectively miniaturize portable electronic devices like smart bracelets and smart watches by optimizing the placement of antenna elements in limited spaces.
Innovation Solution
A portable electronic device design that utilizes a first metal element and a second metal element, where the second metal element is stacked with the battery, forming a coupling antenna to facilitate miniaturization while maintaining operational bands, and the battery and second metal element can be either integrally formed or attached, allowing for efficient heat dissipation and improved radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the portable electronic device is miniaturized, then the device size is reduced, but the space available for antenna elements is limited
Solution Approach 1:
The patent transitions from planar antenna layout to three-dimensional stacked configuration. The first and second metal elements are arranged in different layers above the carrier, utilizing vertical space rather than only horizontal plane. This dimensional change allows antenna elements to be positioned in limited space while maintaining effective radiation area and coupling distance.
Solution Approach 2:
The antenna elements are nested within the device structure by positioning them above the carrier in a stacked arrangement. The first metal element is disposed above the carrier, and the second metal element is also disposed above the carrier with their orthogonal projections overlapping, creating a compact nested configuration that maximizes space utilization.
2Volume of moving object
If the orthogonal projection of the battery and second metal element are overlapped, then space is minimized, but heat dissipation and radiation characteristics must be maintained
Solution Approach 1:
The solution moves heat dissipation and radiation functions to the vertical dimension. By stacking the second metal element above the battery with overlapping projections, the design utilizes the third dimension for both antenna function and thermal management, allowing heat to dissipate vertically while maintaining compact horizontal footprint.
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 design enables the portable electronic device to operate in multiple bands with enhanced radiation characteristics and heat dissipation, meeting the requirements of wearable technology by effectively utilizing limited space.
Implementation Method 1
The portable electronic device operates in at least one band through the first metal element and the second metal element
Implementation Method 2
the second metal element and the ground plane are electrically connected
Data Source
AI summary
A portable electronic device including a substrate, a first metal element, a second metal element and a battery is provided. The substrate has a ground plane. The first metal element is disposed on a carrier and has a feeding point. The second metal element is disposed on the carrier and is electrically connected to the ground plane. The second metal element and the first metal element are spaced apart by a coupling distance, and the portable electronic device operates in at least one band through the first metal element and the second metal element. An orthogonal projection of the battery on the carrier is overlapped with an orthogonal projection of the second metal element.