Narrowband Near-Field Probe Shunt Capacitance RLC Network
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Solution Overview
Problem
Near-field sensors face challenges with high electrical losses and component stress due to large currents and voltages, especially when multiple probes are coupled in series or require tuning over multiple frequencies, leading to increased complexity and cost.
Innovation Solution
Incorporating a shunt capacitance in parallel with the near-field probe's loops or coils to form a high-Q RLC network, which transforms the small resistance into a higher resistance, reducing electrical losses and component stress, and adding series capacitance to lower voltage stresses on matching elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a tuning-matching network is used to match the impedance of the near-field probe to the power amplifier, then the power transfer is maximized, but the electrical losses and component stress increase due to large currents and voltages
Solution Approach 1:
The patent transforms the resistance parameter of the near-field probe from a small value to a larger value using an RLC network. This parameter transformation allows the system to operate with lower currents while maintaining power transfer efficiency, thereby reducing electrical losses in cables and components.
Solution Approach 2:
The patent introduces an RLC network as an intermediary between the power amplifier and the near-field probe. This intermediary network transforms the impedance and reduces the current magnitude, protecting the system from high component stress while maintaining effective power transfer to the probe.
2Strength
If multiple near-field probes are coupled in series to increase magnetic field strength, then the sensing capability is improved, but the current and voltage requirements increase, leading to higher electrical losses and component stress
Solution Approach 1:
By transforming the resistance of each probe using RLC networks, the patent enables multiple probes to be coupled in series with reduced current requirements. The resistance transformation maintains the additive magnetic field effect of series-coupled probes while minimizing the electrical losses that would otherwise increase with higher current demands.
3Adaptability or versatility
If the near-field probe is tuned over multiple frequencies to increase versatility, then the adaptability is improved, but the complexity of the tuning network and component stress increase
Solution Approach 1:
The RLC network provides a systematic approach to frequency tuning by transforming the resistance across different operating frequencies. This method achieves multi-frequency adaptability while maintaining relatively simple circuit topology, avoiding the need for complex switching networks or multiple independent tuning circuits.
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 solution effectively reduces electrical losses in cables and maintains magnetic field strength while lowering the current and voltage requirements, thereby enhancing system efficiency and reliability.
Implementation Method 1
The shunt capacitance and an inductance of the loops or coils of the near-field probe form part of a resistive-inductive-capacitive (RLC) network. The RLC network is configured to transform a smaller resistance of the near-field probe into a larger resistance.
Implementation Method 2
Near-field sensors often include probes formed using electrically-conductive loops or coils, which are used to generate local magnetic fields.
Data Source
AI summary
An apparatus includes a near-field probe having loops or coils of electrically-conductive material, where the near-field probe is configured to generate a magnetic field. The apparatus also includes a power amplifier configured to drive the near-field probe. The apparatus further includes a shunt capacitance coupled in parallel across the loops or coils of the near-field probe. The shunt capacitance and an inductance of the loops or coils of the near-field probe form part of a resistive-inductive-capacitive (RLC) network. The RLC network is configured to transform a smaller resistance of the near-field probe into a larger resistance. In some cases, the apparatus may include multiple near-field probes coupled in series, and the power amplifier may be configured to drive the multiple near-field probes. For each near-field probe, the apparatus may include a shunt capacitance coupled in parallel across the loops or coils of the near-field probe.