Side-Frame Antenna Layout for Low-SAR Radiation Efficiency
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Solution Overview
Problem
Current antenna designs for terminal devices face challenges in achieving high radiation efficiency while maintaining a low specific absorption rate (SAR) of electromagnetic waves, especially when a user holds the device, affecting the antenna's performance.
Innovation Solution
The proposed solution involves an antenna structure where a part of the side frame of the electronic device is configured as a radiator, and a metal stub is used to create a reverse current, which weakens the impact of the current on the ground, thereby reducing the SAR. This structure includes a first radiator, a second radiator, and a third radiator, with specific slots and capacitors to control energy coupling and radiation characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional antenna design is used to achieve high radiation efficiency, then the radiation efficiency is improved, but the specific absorption rate (SAR) increases
Solution Approach 1:
The side frame is divided into multiple radiators (first radiator, second radiator, third radiator) with distinct functions. The first and second radiators are configured to generate reverse currents that counteract each other, while the third radiator serves as a feed stub. This segmentation allows independent optimization of radiation efficiency and SAR reduction for each segment.
Solution Approach 2:
The first and second radiators are designed to generate reverse currents that preemptively counteract the harmful electromagnetic fields before they can be fully absorbed by the human body. By introducing this counteracting action in advance, the patent reduces SAR while maintaining radiation efficiency.
2Object-affected harmful factors
If the antenna structure is modified to reduce SAR, then the specific absorption rate is reduced, but the radiation efficiency deteriorates
Solution Approach 1:
The patent combines multiple functions into a single integrated antenna structure: the side frame serves as both a structural component and an antenna radiator, while the third radiator simultaneously provides feeding and additional radiation. This merging ensures that SAR reduction mechanisms do not compromise overall radiation efficiency.
Solution Approach 2:
The patent optimizes parameters such as the lengths, positions, and spacing of the radiators to achieve both SAR reduction and high radiation efficiency. By carefully adjusting these parameters, the reverse currents are maximized for SAR reduction while maintaining constructive interference for radiation efficiency.
3Object-affected harmful factors
If multiple radiators are introduced to control current distribution, then the SAR is reduced, but the device complexity increases
Solution Approach 1:
The side frame is designed to serve multiple purposes: it provides structural support for the device and simultaneously functions as the antenna radiator system. The third radiator acts as both a radiating element and a feed stub. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
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 reduces the SAR by counteracting reverse currents on the first radiator, while maintaining high radiation efficiency through controlled energy coupling between the radiators, allowing the antenna to operate in multiple frequency bands and improve user experience.
Implementation Method 1
the third radiator is configured as a feed stub, and provides energy for the second radiator in a coupling manner, to generate radiation by using the second slot
Implementation Method 2
energy of coupling between the first radiator and the third radiator and energy of coupling between the first radiator and the ground may be controlled, so that two reverse currents are separately generated on the first radiator, and the two reverse currents counteract each other
Implementation Method 3
a reverse current is constructed by using an introduced metal stub, so that the current is weakly controlled, and impact of a current on a ground of the electronic device on an SAR of the antenna structure is weakened
Data Source
AI summary
An electronic device including an antenna structure is provided. A side frame between a first position and a second position of the electronic device is configured as a first radiator of the antenna structure. A side frame between the second position and a third position of the electronic device is configured as a second radiator of the antenna structure. A first slot is provided at the second position of the side frame. A second slot is formed between the second radiator and a ground. The first radiator extends in a first direction, and is spaced from the third radiator in a second direction. Projections of the third radiator and the first radiator in the second direction at least partially overlap. A first feed point is disposed on the third radiator or the first radiator, and the first feed point is configured to feed the antenna structure.