Dual Antenna Wireless Apparatus for SAR Reduction
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Solution Overview
Problem
Existing wireless communication apparatuses face challenges in reducing specific absorption rate (SAR) without affecting antenna efficiency, as conventional methods require sensing electrodes near the antenna, which can impair efficiency and worsen communication quality when a human body is close.
Innovation Solution
The apparatus employs dual antennas that function as both transmission and sensing elements, with a switch to automatically route data through the antenna least affected by a human body, using high and low frequency filters to prevent interference, allowing for efficient data transmission while minimizing radiation exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a sensor with a sensing electrode is disposed near the antenna to reduce SAR, then the SAR value is reduced, but the antenna efficiency is affected because the sensing electrode is made of conductor
Solution Approach 1:
The patent combines the sensing function and antenna function into a single integrated structure. The antenna elements themselves are used as sensing electrodes to detect human body proximity, eliminating the need for separate sensing electrodes that would interfere with antenna performance. This merging allows the same component to serve dual purposes without the harmful side effects of adding separate sensing elements near the antenna.
Solution Approach 2:
The antenna elements are designed to perform multiple functions: they serve both as radiating elements for wireless communication and as sensing electrodes for detecting human body proximity. This multi-functionality allows the system to reduce SAR by detecting when a human body is near and adjusting power accordingly, while maintaining full antenna efficiency since no additional conductive sensing structures are added near the antenna.
2Object-affected harmful factors
If the antenna power output is reduced when the human body is close to the antenna, then the SAR value is reduced, but the communication quality becomes poorer
Solution Approach 1:
The patent implements dynamic power adjustment based on real-time detection of human body proximity. The system continuously monitors the environment using the antenna elements as sensors and dynamically changes the transmit power level accordingly. When a human body is detected near the antenna, power is reduced to lower SAR; when no human body is present, full power is used to maintain excellent communication quality. This dynamic adaptation resolves the contradiction between SAR reduction and communication quality.
Solution Approach 2:
The system uses the antenna elements to detect human body proximity and feeds this information back to the power control mechanism. This feedback loop allows the system to automatically adjust transmit power based on the detected environment, ensuring that SAR is minimized when humans are present while maintaining optimal communication performance when they are not. The feedback mechanism enables intelligent, context-aware power management.
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 solution maintains or enhances communication quality while reducing non-ionizing radiation absorption by the human body, without the efficiency losses associated with conventional sensing methods.
Implementation Method 1
The sensor is electrically connected to the first antenna and the second antenna for sensing whether a human body is close to at least one of the first antenna and the second antenna
Implementation Method 2
The first high frequency cutoff filter is electrically connected between the feed terminal of the first antenna and the sensor. The second high frequency cutoff filter is electrically connected between the feed terminal of the second antenna and the sensor.
Implementation Method 3
The first feed low frequency cutoff filter is electrically connected between the feed terminal of the first antenna and the switch. The second feed low frequency cutoff filter is electrically connected between the feed terminal of the second antenna and the switch.
Data Source
AI summary
A wireless communication apparatus includes a body, a first antenna, a second antenna, a sensor, a wireless transceiver, and a switch. Both of the first antenna and the second antenna are disposed in or on the body. The sensor is electrically connected to the first antenna and the second antenna for sensing whether an object is close to at least one of the first antenna and the second antenna to provide a sensing result. The wireless transceiver has a main antenna connection port. The switch is coupled to the wireless transceiver, the first antenna, and the second antenna for selecting one from the first antenna and the second antenna to be electrically connected to the main antenna connection port of the wireless transceiver according to the sensing result.