Coplanar Antenna Structure for SAR Reduction
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Solution Overview
Problem
Existing antenna structures in wireless communication devices interfere with other electronic devices, causing electromagnetic wave interference and potentially harmful electromagnetic radiation, which necessitates a reduction in Specific Absorption Rate (SAR) to ensure user safety and compliance with stringent health standards.
Innovation Solution
The antenna structure comprises a microwave substrate with an open loop first circuit, a coplanar second circuit, and a ground circuit, arranged to reduce SAR by optimizing the length and configuration of its components, allowing for efficient signal transmission and reception while meeting efficiency requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional antenna structure is used, then signal transmission and reception can be achieved, but electromagnetic wave interference occurs and SAR increases
Solution Approach 1:
The antenna structure is divided into multiple separate circuits (first circuit, second circuit, ground circuit) rather than using a single continuous structure. The first circuit includes a discontinuous portion that segments the current path, which helps reduce SAR while maintaining antenna efficiency through distributed current flow patterns.
Solution Approach 2:
Different portions of the antenna structure have different configurations optimized for specific functions. The first circuit has a discontinuous portion with specific geometry, the second circuit is positioned at one side, and the ground circuit is positioned at another side, creating local variations in current distribution that reduce electromagnetic radiation exposure.
2Object-affected harmful factors
If the antenna structure is modified to reduce SAR, then electromagnetic radiation exposure decreases, but antenna efficiency may be compromised
Solution Approach 1:
The ground circuit acts as an intermediary element that connects the first circuit and second circuit, providing a reference potential and facilitating signal transmission while controlling electromagnetic field distribution. This intermediary structure enables efficient signal transfer while maintaining reduced SAR characteristics.
Solution Approach 2:
The antenna structure utilizes coplanar arrangement of circuits on the microwave substrate, positioning elements in different spatial regions (one side, another side) rather than overlapping or linear configurations. This dimensional arrangement optimizes both radiation efficiency and SAR reduction by distributing electromagnetic fields in space.
Data Source
AI summary
An antenna structure is disclosed, which includes: a microwave substrate; and a first circuit, a second circuit, and a ground circuit disposed coplanarly on the microwave substrate. The first circuit is an open loop structure with a discontinuous portion having a feed point and a ground point, arranged respectively across the discontinuous portion. The second circuit is connected to a connecting point of the first circuit. The ground circuit is connected to the ground point of the first circuit and the second circuit at the connecting point of the ground circuit. Thus, the antenna structure reduces the SAR. In addition, an electronic device having the same is disclosed.