Ring Antenna Inner Conductor SAR Dispersion
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Solution Overview
Problem
Existing wireless terminal devices face a trade-off between ensuring Specific Absorption Rate (SAR) performance and maintaining wireless performance, as reducing transmission power to meet SAR requirements often results in compromised wireless performance.
Innovation Solution
A ring-shaped antenna with a first conductor connected to its inner side, allowing current dispersion, and optionally featuring a gap of various shapes and a second conductor for improved impedance matching and radiation blocking, is used in conjunction with a printed circuit board to ensure SAR performance without affecting wireless performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If transmission power is reduced to ensure SAR performance, then SAR performance is improved, but wireless performance deteriorates
Solution Approach 1:
The antenna structure is segmented into multiple conductors (first conductor, second conductor, third conductor) that are spatially separated and connected through specific coupling mechanisms. This segmentation allows different parts of the antenna to handle different functions: some conductors optimize SAR performance by controlling current distribution near the human body, while others maintain wireless performance through proper signal transmission paths.
Solution Approach 2:
The antenna employs a nested structure where the first conductor is positioned inside the ring-shaped antenna body, the second conductor is nested within the first conductor, and the third conductor is positioned inside the second conductor. This nested arrangement enables compact integration of multiple functional elements, allowing the antenna to simultaneously achieve SAR compliance through inner conductors and maintain wireless performance through outer conductors.
2Object-affected harmful factors
If a proximity sensor is added near the antenna to reduce transmission power, then SAR performance is improved, but device complexity increases
Solution Approach 1:
The antenna structure itself serves the dual function of both radiating electromagnetic signals and controlling current distribution to meet SAR requirements. The specific geometric configuration and conductor arrangement enable the antenna to automatically optimize its current paths without requiring external control circuits or proximity sensors, thus achieving SAR compliance while maintaining simple device architecture.
Solution Approach 2:
The antenna structure performs multiple functions simultaneously: it acts as the primary radiating element for wireless communication, serves as a current distribution controller for SAR compliance, and provides structural integration for the terminal device. This multi-functionality eliminates the need for separate proximity sensors or additional control mechanisms.
3Object-affected harmful factors
If current is dispersed to reduce SAR, then SAR performance is improved, but wireless performance may be affected
Solution Approach 1:
The antenna design implements local quality optimization by creating different current distribution characteristics in different spatial regions. The inner conductors (first, second, and third conductors) are positioned to control current paths near the human body interface, dispersing current to reduce SAR. Meanwhile, the outer conductors and ring-shaped structure maintain proper current flow for efficient signal radiation, ensuring wireless performance is not compromised.
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 solution effectively disperses current to reduce SAR while maintaining wireless performance, enhancing both SAR and wireless sensitivity without reducing the device's overall performance.
Implementation Method 1
the inner side of the antenna body is connected to a first conductor through a conductor connecting part, so that current on the antenna body is dispersed to the first conductor
Data Source
AI summary
Embodiments of the present invention provide an antenna and a wireless terminal device. Through a first conductor connected to the inner side of an antenna body, the embodiments of the present invention can avoid the problem that in the prior art, while the antenna ensures the Specific Absorption Rate (SAR) performance of the wireless terminal device, the wireless performance of the wireless terminal device is greatly reduced. By adopting technical solutions of the present invention, while the SAR performance of the wireless terminal device is ensured, the wireless performance of the wireless terminal device cannot be affected.