RF Device Capacitive Sensing Antenna Interference Reduction
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Solution Overview
Problem
Existing wireless communication devices face challenges in maintaining antenna efficiency while reducing interference and design/manufacturing costs, as proximity sensors used to detect human presence often narrow the operating frequency band and increase costs due to the need for multiple antenna designs for different frequency bands.
Innovation Solution
A radio-frequency (RF) device and wireless communication device that utilize a capacitive sensing unit connected to the radiating element through a common node, with a DC blocking element and high-frequency blocking element to prevent interference, allowing the existing radiating element to sense environment capacitance without affecting antenna efficiency, and incorporating a capacitor to reduce equivalent capacitance and enhance sensing sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a proximity sensor with metal receiver or sensor is added to detect human body approach, then interference reduction is achieved, but antenna efficiency deteriorates and operating frequency band narrows
Solution Approach 1:
The patent introduces a capacitive sensing unit as an intermediary component that detects human body approach through capacitance changes rather than using metal receivers. This mediator approach allows proximity detection without the harmful interaction between metal sensors and antenna electromagnetic fields, thus maintaining antenna efficiency while achieving interference reduction through proximity-based RF power adjustment
Solution Approach 2:
The patent replaces the traditional metal-based capacitive sensor with an alternative sensing mechanism that uses capacitance detection through the antenna structure itself or through non-metallic components. This substitution eliminates the harmful effect of metal receivers on antenna performance while maintaining the proximity detection function for interference reduction
2Adaptability or versatility
If multiple antennas are designed separately for various communication systems of adjacent frequency bands, then frequency band coverage is improved, but design and manufacturing costs increase and component management becomes complex
Solution Approach 1:
The patent makes the single antenna system universal across multiple frequency bands by implementing a broadband antenna design that can operate effectively in adjacent frequency bands. The antenna structure is designed to maintain adequate radiation efficiency across a wide frequency range, eliminating the need for separate antennas for different communication systems while still providing the required frequency band coverage
Solution Approach 2:
The patent employs dynamic RF power adjustment based on proximity detection to maintain antenna efficiency across different frequency bands. By dynamically controlling the RF power output according to detected human body proximity, the system can adaptively optimize performance across various frequency bands using a single antenna, rather than requiring static multiple antenna designs
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 antenna efficiency, reduces interference, and allows for a single antenna design across adjacent frequency bands, lowering design and manufacturing costs while enhancing assembly efficiency and adaptability.
Implementation Method 1
a capacitive sensing unit, for sensing an environment capacitance within a specific range
Implementation Method 2
a direct-current (DC) blocking element, electrically connected between the second terminal of the connecting unit and the signal feed-in unit, for cutting off a DC signal route
Implementation Method 3
a sensing auxiliary unit, electrically connected between the third terminal of the connecting unit and the capacitive sensing unit, comprising a high-frequency blocking element, for blocking a high-frequency signal route
Implementation Method 4
at least a capacitor, connected to the high-frequency blocking element in series and electrically connected between the third terminal of the connecting unit and the capacitive sensing unit, for decreasing an equivalent capacitance
Data Source
AI summary
A radio-frequency device for a wireless communication device includes an antenna, a capacitive sensing unit, a connecting unit comprising a first terminal electrically connected to a radiating element of the antenna, a second terminal and a third terminal, conducting to each other, a direct-current (DC) blocking element for cutting off a DC signal route between the second terminal of the connecting unit and a signal feed-in unit of the antenna, a sensing auxiliary unit including a high-frequency blocking element for blocking a high-frequency signal route between the third terminal of the connecting unit and the capacitive sensing unit, and at least a capacitor connected to the high-frequency blocking element in series and electrically connected between the third terminal of the connecting unit and the capacitive sensing unit, for decreasing an equivalent capacitance from the connecting unit to the radiating element.