Switchable Antenna Structure for 5G Bandwidth and SAR Control
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Solution Overview
Problem
Conventional antenna structures in electronic devices fail to meet the requirements of the 5G technology standard and often increase the specific absorption rate (SAR) of electromagnetic waves, exceeding safety limits.
Innovation Solution
An electronic device with an antenna structure comprising a first and second radiating element, a feeding element, and a grounding element, connected to a switching circuit that adjusts operation bandwidth and central frequency, and includes a proximity sensing circuit with an inductor to manage SAR by sensing human proximity and adjusting radiation power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional antenna structures are used to enhance efficiency, then antenna efficiency is improved, but SAR value increases exceeding safety limits
Solution Approach 1:
The patent applies dynamics by making the antenna structure adjustable through a switching circuit that can switch between different operating modes (first mode and second mode). This allows the antenna to dynamically change its electrical characteristics, including impedance and resonant frequency, thereby optimizing antenna efficiency while controlling SAR exposure based on actual operating conditions
Solution Approach 2:
The patent implements parameter changes by modifying the electrical parameters of the antenna structure through the switching circuit. By changing the configuration of the radiating elements and their connections to the feeding element, the antenna can adjust its impedance matching and resonant frequency, achieving both high efficiency and SAR compliance through parameter optimization
2Adaptability or versatility
If antenna structure is designed for 5G operation bandwidth, then 5G compatibility is achieved, but design complexity increases
Solution Approach 1:
The patent applies universality by designing an antenna structure that can serve multiple functions and support different operation bandwidths. The same physical antenna structure, when combined with the switching circuit, can operate in different modes to support both 4G and 5G frequency bands, eliminating the need for separate antennas for different standards
Solution Approach 2:
The patent uses dynamics to enable the antenna to adapt to different 5G operation bandwidth requirements. The switching circuit allows the antenna to dynamically reconfigure its electrical characteristics, making it compatible with various 5G frequency bands without requiring multiple fixed-frequency antennas, thus managing design complexity while achieving broad 5G compatibility
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 allows for adjustable operation bandwidth and central frequency, effectively meeting 5G standards while maintaining SAR within safety limits by dynamically adjusting radiation power based on human proximity.
Implementation Method 1
When the switching circuit is switched to a first mode, the antenna structure generates a first operation bandwidth, and when the switching circuit is switched to a second mode, the antenna structure generates a second operation bandwidth
Implementation Method 2
at least one inductor, and a proximity sensing circuit... The at least one inductor is connected in series between the first radiating element and the proximity sensing circuit
Data Source
AI summary
An electronic device including an antenna structure and a switching circuit is provided. The antenna structure includes a first radiating element, a second radiating element, a feeding element and a grounding element. The first radiating element incudes a first radiating part and a feeding part. The second radiating element is coupled with the first radiating element, and includes a main body and an arm that is electrically connected to the switching circuit. The feeding element includes a feeding end electrically connected to the feeding part, and a grounding end electrically connected to the grounding element. The antenna structure generates a first operation bandwidth and second operation bandwidth when the switching circuit is switched to a first and second mode, respectively. A central frequency of the first operation bandwidth is different from that of the second operation bandwidth.