Antenna Structure with Open Loop Circuit for SAR Reduction
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Solution Overview
Problem
Current antenna structures in wireless communication devices interfere with other electronic devices, causing electromagnetic wave interference and potentially harmful electromagnetic radiation, leading to high Specific Absorption Rate (SAR) values that need to be reduced for user safety and compliance with stringent international standards.
Innovation Solution
The antenna structure features a microwave substrate with an open loop circuit design having a discontinuous portion, a feed point, and a ground point, along with a coplanarly connected second circuit and ground circuit, which reduces SAR by optimizing electromagnetic energy distribution and resonant frequency alignment with wireless communication standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional antenna structures are used in wireless communication devices, then wireless communication function is achieved, but electromagnetic wave interference with surrounding electronic devices occurs and SAR value exceeds safety limits
Solution Approach 1:
The antenna structure is divided into multiple independent circuits: a first circuit with feed point and ground point, a second circuit connected to the first circuit, and a ground circuit connected to the ground point. This segmentation allows each circuit to contribute differently to electromagnetic field distribution, reducing SAR while maintaining communication efficiency
Solution Approach 2:
Different regions of the antenna structure are designed with distinct functions: the first circuit provides primary radiation, the second circuit modifies field distribution in specific areas, and the ground circuit establishes reference potential. This local differentiation optimizes both SAR reduction and antenna performance in specific zones
2Object-affected harmful factors
If antenna structure is designed to reduce electromagnetic radiation, then SAR value decreases, but antenna efficiency may be compromised
Solution Approach 1:
The patent converts potentially harmful electromagnetic radiation into beneficial field distribution patterns. The multiple circuits are designed to create constructive interference in communication directions while producing destructive interference in directions toward the user's head, transforming radiation from a harmful effect into a controlled field pattern that reduces SAR
Solution Approach 2:
The antenna structure modifies electromagnetic field parameters through its circuit configuration. By adjusting the geometry, connectivity, and impedance of the first, second, and ground circuits, the patent changes the distribution pattern of electromagnetic energy, achieving lower SAR values while preserving the energy efficiency needed for effective communication
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 lowers SAR below 1.6 W/kg while maintaining antenna efficiency, meeting regulatory requirements and minimizing electromagnetic radiation exposure to users.
Implementation Method 1
a first circuit disposed on the microwave substrate, wherein the first circuit is an open loop structure with a discontinuous portion and has a pair of ends, namely a feed point and a ground point, arranged respectively across the discontinuous portion
Implementation Method 2
a second circuit, disposed coplanarly on the microwave substrate, being connected to a connecting point of the first circuit on one side thereof
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 and has a pair of ends, namely a feed point and a ground point, arranged respectively across the discontinuous portion. The ground point is connected to the ground circuit. The second circuit is disposed at the periphery of the first circuit, where the second circuit is connected to a connecting point of the first circuit on one side thereof. Thereby, the antenna structure reduces the SAR. In addition, an electronic device having an antenna structure is disclosed.