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Reduction of S-parameter errors using singular spectrum analysis.

Turgut Ozturk1, İhsan Uluer1, İlhami Ünal2

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This study introduces a singular spectrum analysis method to accurately measure material dielectric properties in the W-Band frequency range. The technique enhances data reliability by effectively removing noise and calibration errors.

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Area of Science:

  • Electromagnetics
  • Materials Science
  • Signal Processing

Background:

  • Accurate dielectric property measurement is crucial for material characterization.
  • Free space measurement methods in the W-Band (75-110 GHz) are susceptible to noise and calibration errors.
  • Existing data processing techniques can be complex and time-consuming.

Purpose of the Study:

  • To develop a robust method for processing S21 transmission coefficient data obtained from W-Band free space measurements.
  • To improve the accuracy and reliability of dielectric property determination for various materials.
  • To present a signal processing technique that minimizes the need for repeated calibration.

Main Methods:

  • Utilized a free space measurement setup with horn antennas and a network analyzer (75-110 GHz).
  • Applied Singular Spectrum Analysis (SSA) to denoise and filter raw S21 transmission data.
  • Employed thin sheet approximation and Newton-Raphson techniques to extract dielectric constants from processed S21 data.

Main Results:

  • Successfully eliminated noise and calibration errors from raw S21 data using SSA.
  • Obtained smooth, reliable, and accurate transmission parameters.
  • Demonstrated the ability to determine the dielectric constants of paper, PVC, Ultralam® 3850HT, and glass with improved precision.

Conclusions:

  • Singular Spectrum Analysis is an effective tool for enhancing the quality of W-Band free space measurement data.
  • The proposed method simplifies the measurement process by reducing the need for frequent recalibration.
  • This approach provides a reliable pathway for accurate material dielectric property characterization in the W-Band.