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Geometry optimization of broadband, planar, spiral inductors via continuous trace width modulation.

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Variable-width planar inductors outperform constant-width designs across a broad frequency range. Continuous trace width modulation enhances DC magnetic fields and improves RF quality factors for broadband inductor applications.

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Materials Science

Background:

  • Planar inductors are crucial components in electronic circuits.
  • Constant-width inductors show frequency-specific performance advantages.
  • Broadband inductor design remains a challenge for DC to low RF applications.

Purpose of the Study:

  • To investigate the broadband performance of variable-width planar inductors.
  • To compare variable-width designs against constant-width inductors from DC to several hundred MHz.
  • To demonstrate the efficacy of continuous trace width modulation for enhanced inductor performance.

Main Methods:

  • Designed and simulated circular spiral inductors with constant and variable trace widths.
  • Fabricated selected inductor designs.
  • Experimentally characterized DC magnetic flux density and RF performance (inductance, quality factor) using reflection coefficient measurements.

Main Results:

  • Variable-width inductors generated stronger DC magnetic fields under equivalent bias.
  • Variable-width inductors exhibited higher quality factors in the low RF range.
  • Consistent performance enhancement across the entire DC to low RF spectrum was observed.

Conclusions:

  • Continuous trace width modulation is an effective technique for designing high-performance broadband inductors.
  • Variable-width inductors offer superior performance compared to constant-width designs across a wide frequency range.
  • This approach enables inductor optimization for broad spectral applications, not just specific frequencies.