Variable Reactance Transmitter for Electric Field Communication
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Solution Overview
Problem
Downsizing of electric field communication transceivers leads to increased parasitic capacitance, reducing the voltage amplitude applied to the human body, which hampers data communication quality and power supply efficiency, and existing solutions require complex compensation circuits and increased power consumption.
Innovation Solution
The implementation of a transmission device with adjustable reactance means, including a self-adjusting variable reactance section using a resonance circuit with a variable capacitance diode and inductor, to optimize voltage application across the human body without external compensation circuits, enabling efficient data communication and power transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the transceiver is downsized to reduce device size, then the device dimensions are reduced, but the parasitic capacitance increases which reduces the voltage amplitude applied to the human body
Solution Approach 1:
The patent employs a variable reactance means that can dynamically adjust its reactance value to compensate for changes in parasitic capacitance. This dynamic adjustment allows the system to maintain optimal voltage amplitude despite the increased parasitic capacitance caused by downsizing, resolving the contradiction between reduced device size and maintained power output.
Solution Approach 2:
The patent changes the reactance parameter of the transmission circuit to compensate for the increased parasitic capacitance. By adjusting the reactance value, the system optimizes the voltage amplitude applied to the human body, thereby resolving the contradiction between downsized transceiver and sufficient power delivery.
2Power
If a variable reactance is inserted to compensate for parasitic capacitance fluctuations, then the voltage amplitude applied to the human body is improved, but the device complexity increases due to additional compensation circuits
Solution Approach 1:
The patent implements a self-adjusting variable reactance means that automatically adapts to parasitic capacitance changes without requiring external control circuits or manual intervention. This self-service mechanism maintains optimal voltage amplitude while minimizing device complexity by eliminating the need for complex compensation control systems.
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor the actual voltage amplitude or parasitic capacitance conditions and automatically adjust the reactance value accordingly. This feedback-based approach ensures optimal performance while keeping the control system relatively simple through automatic rather than manual adjustment.
3Reliability
If complex compensation circuits are used to adjust reactance, then the communication quality is maintained, but the power consumption increases
Solution Approach 1:
The self-adjusting variable reactance means operates autonomously to maintain communication quality without requiring power-intensive external control circuits. This self-service capability ensures reliable data transmission while minimizing power consumption by eliminating redundant control system components.
Solution Approach 2:
The dynamic adjustment of reactance values allows the system to adapt to changing conditions and maintain optimal communication quality. This dynamic approach ensures reliable data transmission through the human body while consuming less power compared to static or over-engineered compensation systems.
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 high communication quality and power supply efficiency even in downsized transceivers, reducing power consumption and eliminating the need for complex compensation circuits, while enabling self-adjustment of reactance values for optimal performance.
Implementation Method 1
a resonance circuit with a variable capacitance diode and inductor
Implementation Method 2
induce an electric field based on data to be transmitted in a human body
Data Source
AI summary
There is provided a transmission means (3) configured to transmit a modulated signal obtained by modulating data, a transmission electrode (8) that induces an electric field based on the modulated signal in an electric field transmission medium (20), a first reactance means (2) that is provided between the electric field transmission medium (20) and an earth ground (14) and configured to cause resonance with parasitic capacitance produced between a ground (6) the transmission means (3) and the earth ground (14), parasitic capacitance produced between the electric field transmission medium (20) and the ground (6) of the transmission means (3) and parasitic capacitance produced between the electric field transmission medium (20) and the earth ground (14), and a second reactance means (1) provided between an output of the transmission means (3) and the ground (6) of the transmission means (3) or between the transmission electrode (8) and the ground (6) of the transmission means (3).