Segmented Terminal Antenna Layout for Lower SAR Radiation
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Solution Overview
Problem
Existing antennas in electronic devices often have high Specific Absorption Rate (SAR) values, leading to increased absorption of electromagnetic waves by the human body, which can affect health and hinder wireless communication performance.
Innovation Solution
A terminal antenna design featuring multiple radiating elements connected in series, with a reactance element and a feed arrangement that promotes uniform current distribution and a zero-order mode operation, reducing SAR while enhancing radiation performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional antenna design is used, then radiation performance can be achieved, but SAR value is high causing health concerns
Solution Approach 1:
The antenna radiator is divided into multiple segments with different electrical lengths. Each segment is connected to ground through independent reactance elements, allowing separate control of current distribution in different regions. This segmentation enables uniform current distribution across the radiator, reducing SAR value while maintaining radiation performance.
Solution Approach 2:
Different reactance elements are configured with different electrical characteristics to achieve local optimization. The reactance elements are positioned at specific locations along the radiator to control current distribution locally. This local quality adjustment ensures uniform current distribution throughout the antenna structure, simultaneously improving SAR performance and radiation efficiency.
2Reliability
If the length of radiating element is increased to improve radiation performance, then radiation efficiency improves, but the antenna size increases
Solution Approach 1:
The antenna design changes the electrical parameters of different radiator segments rather than simply increasing overall length. By adjusting the electrical length of each segment and the reactance of ground elements, the antenna achieves enhanced radiation efficiency through optimized current distribution. This parameter-based optimization improves performance without requiring proportional increases in physical 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 design achieves lower SAR values and improved radiation efficiency, ensuring better wireless communication quality by dispersing electromagnetic wave energy uniformly and reducing hotspot concentrations.
Implementation Method 1
The N radiating elements include a first radiating element, and a feed is arranged at one end of the first radiating element away from the reactance element
Implementation Method 2
An antenna in an electronic device may provide a wireless communication function by radiating electromagnetic waves
Implementation Method 3
By arranging a ground component on each radiating element, a current on a radiator can be uniformly adjusted when the radiating element operates, to obtain relatively uniform current distribution at a feed end and a ground end and stimulate a uniform normal electric field for radiation
Data Source
AI summary
A terminal antenna includes a first radiator. The first radiator includes N radiating elements connected end to end, where N is an integer greater than or equal to 2. One end of any one of the radiating elements is grounded through a reactance element. The N radiating elements include a first radiating element, and a feed is arranged at one end of the first radiating element away from the reactance element.