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Multi-turn, printed surface coil inductance, and Q optimization

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  • 1Institut d'Electronique Fondamentale CNRS URA 22 Université de Paris, Orsay, France.

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|March 1, 1993
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Summary
This summary is machine-generated.

Researchers modified Wheeler

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Antenna Design

Background:

  • Wheeler's empirical formula accurately predicts inductance for multi-turn, close-wound flat coils.
  • The optimal outer-to-inner radius ratio for maximum inductance in these coils is 15/7.
  • Surface coil antenna design requires inductance optimization for printed spiral coils.

Purpose of the Study:

  • To develop a modified inductance formula for flat, printed spiral coils used in surface coil antennas.
  • To determine the optimal radius ratio for maximizing inductance and quality factor (Q) in these printed coils.

Main Methods:

  • Modified Wheeler's empirical inductance formula by adjusting a coefficient.
  • Designed and fabricated flat, printed spiral coils.
  • Measured the inductance of the fabricated coils.
  • Compared measured inductance values with predictions from the modified formula.

Main Results:

  • The modified formula provides accurate inductance predictions for flat, printed spiral coils.
  • The optimal outer-to-inner radius ratio for maximum inductance or Q in printed spiral coils is approximately 9/5.
  • Measured inductance values closely matched the predictions of the new formula.

Conclusions:

  • The modified Wheeler's formula is effective for optimizing inductance in flat, printed spiral surface coil antennas.
  • The optimal radius ratio of 9/5 offers a significant improvement for antenna performance compared to previous findings.