Antenna Capacitive Sensing for SAR Control
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Solution Overview
Problem
Existing wireless communication devices face challenges in maintaining antenna efficiency while reducing interference, as prior art methods using proximity sensors with metal materials narrow the operating frequency band and increase design and manufacturing costs.
Innovation Solution
The solution involves a capacitive sensing unit electrically connected to the radiating element of the antenna to sense environment capacitance, adjusting RF signal power accordingly, and using a capacitor to cut off the direct-current signal route, eliminating the need for additional sensors that affect antenna efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a proximity sensor with metal materials is added to detect human body approach, then interference (SAR) can be reduced by adjusting RF power, but the operating frequency band becomes narrow and antenna efficiency deteriorates
Solution Approach 1:
The radiating element of the antenna is designed to perform dual functions: both radiation and capacitance sensing. By using the existing antenna structure for sensing instead of adding separate metal sensors, the patent maintains broadband operation while enabling SAR detection and compensation, thus resolving the contradiction between interference reduction and frequency band adaptability
Solution Approach 2:
The antenna's radiating element serves itself by detecting capacitance changes caused by human body approach. The same structure that radiates RF signals also senses the environmental capacitance variation, eliminating the need for additional sensing components that would narrow the bandwidth or reduce efficiency
2Object-affected harmful factors
If a proximity sensor is added to detect human body approach, then interference can be reduced, but design and manufacturing costs increase due to multiple antennas for various communication systems
Solution Approach 1:
The patent makes the antenna system universal by enabling a single antenna to handle multiple communication frequency bands while simultaneously performing capacitance sensing for SAR control. This eliminates the need for multiple separate antennas for different communication systems, thereby reducing design and manufacturing complexity and costs
Solution Approach 2:
The patent merges the sensing function with the existing antenna structure rather than adding separate sensing components. By combining the radiation and sensing functions into a single integrated structure, the patent reduces the total number of components and simplifies manufacturing processes
3Object-affected harmful factors
If a proximity sensor is added to detect human body approach, then interference can be reduced, but component management becomes more difficult
Solution Approach 1:
The patent extracts the sensing capability from separate sensing components and integrates it into the antenna structure itself. By taking out the need for additional sensors and making the antenna self-sensing, the patent reduces component count and simplifies management while maintaining the ability to reduce interference through RF power adjustment
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 approach maintains antenna efficiency, reduces interference, and allows for a single antenna design for various communication systems, thereby lowering design and manufacturing costs and enhancing component management.
Implementation Method 1
a capacitive sensing unit electrically connected to the radiating element of the antenna for sensing an environment capacitance within a specified range via the radiating element
Implementation Method 2
at least a capacitor coupled between the ground terminal of the antenna and the grounding unit for cutting off a direct-current signal route from the ground terminal to the grounding unit
Data Source
AI summary
A radio-frequency (RF) device and a wireless communication device include a capacitive sensing unit capable of using a radiating element of an antenna to sensing an environment capacitance within a specified range, such that an RF signal processing device is capable of adjusting power of an RF signal accordingly, to prevent affecting a user. When the radiating element of the antenna includes a direct-current signal route to a ground terminal, the RF device and the wireless communication device further includes at least a capacitor for cutting off the direct-current signal route.