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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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A Two-Turn Shielded-Loop Magnetic Near-Field PCB Probe for Frequencies up to 3 GHz.

Mario Filipašić1, Martin Dadić1

  • 1Department of Electrical Engineering Fundamentals and Measurements, Faculty of Electrical Engineering and Computing, University of Zagreb, Unska 3, 10000 Zagreb, Croatia.

Sensors (Basel, Switzerland)
|August 26, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a new shielded two-turn near-field probe design, enhancing sensitivity and electric field suppression for electromagnetic measurements up to 3 GHz. The novel design increases probe sensitivity by 10.1 dB compared to conventional probes.

Keywords:
electromagnetic compatibility measurementsmagnetic field measurementmagnetic near-field probeprobe sensitivity

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Area of Science:

  • Electromagnetics and Applied Physics
  • Microwave Engineering
  • Printed Circuit Board (PCB) Design

Background:

  • Near-field probes are crucial for characterizing electromagnetic fields.
  • Existing probes face limitations in sensitivity and electric field suppression.
  • Optimization of probe topology is essential for improved performance.

Purpose of the Study:

  • To propose and evaluate a novel shielded two-turn near-field probe design.
  • To investigate the influence of different two-turn loop topologies on probe sensitivity.
  • To compare the performance of two-turn probes against single-loop designs.

Main Methods:

  • Simulation of probe designs using Ansys HFSS.
  • Fabrication of probes on a standard four-layer FR4 PCB.
  • Development of a measurement setup using a vector network analyzer and a custom PCB probe stand.

Main Results:

  • The proposed two-turn probe design significantly increases sensitivity.
  • Average sensitivity improvement of 10.1 dB was observed up to 1 GHz compared to conventional designs.
  • The two-turn design minimizes impact on probe spatial resolution.

Conclusions:

  • The novel shielded two-turn near-field probe offers superior sensitivity and electric field suppression.
  • This design is suitable for electromagnetic measurements up to 3 GHz.
  • The findings contribute to advancements in near-field measurement techniques.