RF Antenna Capacitance Sensing for Signal Adjustment
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Solution Overview
Problem
Communication devices face efficacy reduction and insufficient bandwidth due to the presence of a human body and ambient electronic devices, which affect radio frequency signal transmission.
Innovation Solution
A communication device comprising an antenna unit, a sensing and processing unit, and an adjustment unit that adjusts the frequency and bandwidth of radio frequency signals based on sensed capacitance and system signals, using a switch and electronic components to optimize signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed frequency and bandwidth are used for radio frequency signal transmission, then the device structure is simple, but the signal transmission efficiency deteriorates when a human body or electronic device is nearby
Solution Approach 1:
The patent implements dynamic adjustment of frequency and bandwidth parameters based on real-time sensing of capacitance changes caused by human body proximity. The system transitions from fixed parameters to dynamically adjustable parameters, allowing the communication device to adapt its transmission characteristics according to the detected environmental conditions, thereby maintaining signal transmission efficiency.
Solution Approach 2:
The patent changes the physical parameters (frequency and bandwidth) of the radio frequency signal based on sensed capacitance values. When a human body is detected nearby, the system adjusts these parameters to compensate for the adverse effects on signal transmission, directly applying parameter changes to resolve the technical contradiction.
2Reliability
If the antenna bandwidth is increased to improve signal transmission, then the signal coverage is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of designing a physically wide-bandwidth antenna that is complex to manufacture, the patent uses dynamic adjustment of the operating bandwidth through electronic control. The antenna structure remains simple, but its effective bandwidth is dynamically adjusted based on sensing data, achieving improved signal coverage without increasing manufacturing complexity.
Solution Approach 2:
The patent adjusts the operational bandwidth parameter of the antenna system based on capacitance sensing, rather than relying on a physically wide bandwidth design. This allows the system to achieve adequate signal coverage by dynamically expanding the effective bandwidth when needed, while maintaining a simple antenna structure that is easy to manufacture.
3Measurement precision
If complex computation algorithms are used to compensate for frequency shifts, then the signal accuracy is improved, but the processing time and energy consumption increase
Solution Approach 1:
The patent performs preliminary action by sensing capacitance changes and adjusting frequency parameters proactively before significant signal degradation occurs. By detecting the presence of a human body through capacitance sensing and pre-adjusting the frequency, the system avoids the need for complex real-time computation algorithms, reducing processing time while maintaining frequency accuracy.
Solution Approach 2:
The patent implements a feedback mechanism where capacitance sensing provides real-time information about environmental conditions, and this feedback directly controls frequency and bandwidth adjustments. This closed-loop feedback system maintains frequency accuracy through simple sensing and direct control, eliminating the need for complex computation algorithms that would increase processing time.
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
Effectively addresses frequency shifts and bandwidth issues caused by human bodies and ambient electronic devices, improving signal transmission efficiency without complex computations.
Implementation Method 1
The sensing and processing unit is configured to sense a capacitance through the antenna unit
Data Source
AI summary
A communication device includes an antenna unit, an adjustment unit and a sensing and processing unit. The sensing and processing unit is electrically coupled to the antenna unit and the adjustment unit. The antenna unit is configured to transmit a radio frequency (RF) signal. The adjustment unit is configured to adjust a frequency and a bandwidth of the RF signal. The sensing and processing unit is configured to sense a capacitance, so as to control the adjustment unit to adjust the frequency of the RF signal according to the capacitance, and to control the adjustment unit to adjust the bandwidth of the RF signal according to a system signal.