Segmented Mobile Antenna Layout With Edge Notches for Lower SAR
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Solution Overview
Problem
Antennas in mobile devices are susceptible to interference from adjacent metal components, leading to degraded communication quality and high Specific Absorption Rate (SAR) that may not comply with regulatory standards.
Innovation Solution
A novel antenna structure comprising a grounding radiation element, feeding radiation element, main radiation element, and side radiation elements, with edge notches and a closed slot region, disposed on a dielectric substrate, to form a planar or 3D antenna structure that supports multiple frequency bands and reduces SAR by altering current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional antenna structure is used, then communication function is provided, but SAR is too high to comply with regulations and adjacent metal components interfere with the antenna
Solution Approach 1:
The radiation element is divided into multiple segments with different shapes (first radiation element, second radiation element, third radiation element) arranged in specific spatial relationships. This segmentation allows each segment to contribute differently to the overall radiation pattern, reducing peak SAR while maintaining communication reliability across multiple frequency bands.
Solution Approach 2:
The antenna structure transitions from a planar configuration to a three-dimensional arrangement by positioning radiation elements at different heights (first height and second height) and orientations. This dimensional change enables better control of electromagnetic field distribution, reducing SAR exposure while maintaining radiation efficiency.
2Object-affected harmful factors
If antenna structure is modified to reduce SAR, then SAR compliance is improved, but device complexity increases
Solution Approach 1:
Multiple radiation elements serving different frequency bands (first, second, and third frequency bands) are merged into a single integrated antenna structure. This consolidation achieves SAR reduction across all bands while avoiding the complexity of multiple separate antenna systems.
Solution Approach 2:
The antenna structure is designed to perform multiple functions simultaneously: it provides communication across three different frequency bands, reduces SAR compliance issues, and maintains compact form factor. The radiation elements are configured to serve both Wi-Fi and other wireless communication standards.
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 antenna structure achieves reduced SAR by up to 50% in certain frequency bands, maintains wideband operation, and meets regulatory standards while minimizing device size and manufacturing costs.
Implementation Method 1
a first radiation element 131, a second radiation element 132, and a third radiation element 133... The antenna structure covers a first frequency band, a second frequency band, and a third frequency band
Implementation Method 2
The grounding radiation element, the feeding radiation element, the main radiation element, the first side radiation element, and the second side radiation element are all disposed on the dielectric substrate
Data Source
AI summary
A mobile device for reducing SAR (Specific Absorption Rate) includes a grounding radiation element, a feeding radiation element, a main radiation element, a first side radiation element, a second side radiation element, and a dielectric substrate. The main radiation element is coupled to the feeding radiation element. The first side radiation element is coupled to the feeding radiation element. The main radiation element is coupled through the first side radiation element to a first grounding point on the grounding radiation element. The main radiation element is also coupled through the second side radiation element to a second grounding point on the grounding radiation element. An antenna structure is formed by the grounding radiation element, the feeding radiation element, the main radiation element, the first side radiation element, and the second side radiation element. The main radiation element and the feeding radiation element have a plurality of edge notches.