Antenna Layout Near Housing Opening for Low-SAR Wireless Communication
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Solution Overview
Problem
Wireless communication apparatuses, such as digital radiography (DR) devices, face challenges in maintaining a high radiant quantity of radio waves at communication frequencies while minimizing the specific absorption rate (SAR) value to prevent excessive electromagnetic wave absorption by the human body.
Innovation Solution
The wireless communication apparatus is designed with an antenna configuration where the antenna is positioned closer to the opening of the outer housing than the fixing member, and the electric supply unit and a first region of the antenna element are disposed closer to the fixing member than a second region including the open end portion of the antenna element. This configuration helps in reducing the SAR value and preventing a reduction in radiant quantity of radio waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric power supplied to the antenna is increased to compensate for reduced radiated power, then the radiant quantity of radio waves is improved, but the SAR value becomes greater than the limit
Solution Approach 1:
The patent changes the spatial arrangement parameters of antenna components relative to conductive structures. Specifically, it positions the antenna element such that its open end is closer to the outer housing opening than to the fixing member, and arranges the electric supply unit and first region closer to the fixing member than the second region including the open end. This parameter optimization improves radiation efficiency without increasing power, thereby maintaining SAR within limits.
2Stability of the object's composition
If the antenna is positioned closer to the fixing member, then the structural stability is improved, but the radiant quantity of radio waves is reduced
Solution Approach 1:
The patent applies different spatial positioning strategies to different parts of the antenna structure. The antenna element is positioned with its open end closer to the outer housing opening for optimal radiation, while the electric supply unit and first region are positioned closer to the fixing member for structural support. This localized differentiation allows each component to fulfill its primary function without compromising overall performance.
3Object-affected harmful factors
If the outer housing is enclosed completely, then the protection and size reduction are improved, but the radiant quantity of radio waves is reduced due to electromagnetic wave blockage
Solution Approach 1:
The patent extracts an opening in the outer housing at the position corresponding to the antenna element's open end. This opening allows electromagnetic waves to radiate outward from the antenna without being blocked by the conductive outer housing. The opening is strategically positioned to provide necessary radiation pathways while maintaining the protective enclosure for other components.
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 effectively decreases the SAR value while maintaining or enhancing the radiant quantity of radio waves at communication frequencies, thus addressing the dual challenges faced by wireless communication apparatuses.
Implementation Method 1
an antenna (160) including an antenna element (161, 162)... allowing electromagnetic waves from the antenna (160) to radiate outward from the outer housing (180)
Implementation Method 2
when high-power electromagnetic waves emitted by an antenna of a wireless communication apparatus enter a human body and are absorbed by the human body, a temperature of the human body locally rises
Data Source
AI summary
In a wireless communication apparatus according to the present invention, an antenna including an antenna element is disposed at a position closer to an opening of an outer housing than to a fixing member formed of an electric conductor and configured to fix the antenna, and an electric supply unit configured to supply the antenna with electric power and a first region that is positioned on an electric supply unit side of the antenna element are disposed closer to the fixing member than a second region including an open end portion of the antenna element.