Single-Coil Transceiver Circuit for Subsurface Two-Way Communication
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Solution Overview
Problem
Existing wireless communication systems for subsurface sensors face challenges such as inadequate range, unreliable operation due to changing electromagnetic characteristics of materials, large equipment sizes incompatible with easy installation, and excessive power consumption, particularly in electromagnetic-absorbing materials like soil or concrete.
Innovation Solution
A transceiver circuit with a resonant portion, switches, amplifier, and demodulator is designed to enable two-way communication, allowing for transmission and reception at the same frequency, with adjustable impedance and frequency selection to optimize energy efficiency and reduce power consumption, while isolating components during transmission and reception to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If electromagnetic wireless communication is used to communicate data from subsurface sensors, then wired connection problems are avoided, but communication range is inadequate due to attenuation of electromagnetic waves in electromagnetic-absorbing materials
Solution Approach 1:
The system dynamically switches between transmission mode and reception mode using control circuitry that activates different circuit configurations. During transmission, the circuit is configured for high power output; during reception, it is configured for sensitive signal detection. This dynamic adaptation allows the single coil to effectively perform both functions despite the challenging electromagnetic environment.
Solution Approach 2:
The system changes operating parameters including frequency selection from multiple available frequencies, power levels, and circuit impedance to optimize performance for either transmission or reception. By selecting appropriate frequencies and adjusting power parameters, the system overcomes signal attenuation in electromagnetic-absorbing materials during transmission while maintaining sensitivity during reception.
2Ease of operation
If electromagnetic wireless communication is used for subsurface sensors, then wired connection problems are avoided, but operation becomes unreliable due to changes in electromagnetic characteristics of the material
Solution Approach 1:
The system employs dynamic frequency selection and circuit reconfiguration based on detected signal conditions. When material electromagnetic characteristics change, the control circuitry detects signal quality degradation and switches to alternative frequencies or adjusts transmission parameters to maintain reliable communication.
Solution Approach 2:
The system uses feedback from signal quality detection to automatically adjust transmission parameters, frequency selection, and power levels. The control circuitry monitors communication effectiveness and modifies operating parameters in response to changes in material electromagnetic characteristics, ensuring continuous reliable operation.
3Reliability
If large equipment/antenna sizes are used to improve communication range, then signal attenuation is overcome, but installation and removal of buried sensors becomes difficult
Solution Approach 1:
The system merges the transmission coil and reception coil into a single integrated coil assembly. This combined coil performs both transmission and reception functions, eliminating the need for separate large antenna structures. The single coil design maintains adequate communication range while being compact enough for easy installation and removal of subsurface sensors.
Solution Approach 2:
The single coil assembly serves multiple functions - it acts as both the transmitting antenna and the receiving antenna. This multi-functional design replaces what would traditionally require separate specialized components, achieving space efficiency and installation ease without sacrificing communication capability.
4Loss of information
If continuous transmission is used to maintain communication, then data is continuously available, but power consumption is excessive for long-term or battery-powered operation
Solution Approach 1:
Instead of continuous transmission, the system employs periodic transmission bursts triggered by sensor events or scheduled intervals. The control circuitry activates transmission only when data needs to be communicated, keeping the system in a low-power state during idle periods. This periodic operation maintains data availability while dramatically reducing average power consumption for battery-powered subsurface sensors.
Solution Approach 2:
The system maintains continuous monitoring capability with sensors always active, but only activates transmission when necessary. The control circuitry continuously manages sensor operation and communication readiness, but actual electromagnetic transmission occurs only during needed data transfers, optimizing the balance between data availability and power consumption.
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
The system achieves efficient two-way communication with improved battery life and flexibility in transmission behavior, enabling on-demand data acquisition and firmware updates for subsurface sensors, suitable for various applications including agriculture, infrastructure monitoring, and environmental sensing.
Implementation Method 1
The resonant portion can include a single radiofrequency (RF) coil and the resonant portion can be configured for transmission and reception at about the same frequency
Implementation Method 2
The processor can be configured to command the second and third switches to close and command the first switch to open and close at a closure frequency that provides current from the power source to the radiofrequency coil in the form of a carrier signal
Data Source
AI summary
In an embodiment, a circuit includes a resonant portion, a plurality of switches, a first impedance, an amplifier, and a demodulator. The resonant portion includes a single RF coil and is configured for transmission/reception at about the same frequency. The switches include first, second, and third switches. The first switch includes an input in communication with a power source and an output in communication with ground. The second switch includes an input between the power source and the first switch and an output in communication with a resonant portion input. The third switch includes an input in communication with a resonant portion output and an output in communication with ground. The first impedance is between the resonant portion output and the third switch input. The amplifier includes an input between the first impedance and the third switch input. The demodulator includes an input in communication with the amplifier output.