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Measurement of Dielectric Multipactor Thresholds at 110 GHz.

S C Schaub1, M A Shapiro1, R J Temkin1

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

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Researchers measured multipactor discharge thresholds on dielectric surfaces at 110 GHz, finding significantly higher thresholds than at lower microwave frequencies. These findings align with theoretical predictions, improving understanding of high-frequency multipactor behavior.

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Area of Science:

  • Plasma Physics
  • Materials Science
  • Electromagnetics

Background:

  • Multipactor discharges are a significant concern in high-frequency electronic systems, potentially leading to device failure.
  • Understanding the behavior of multipactor discharges on dielectric surfaces is crucial for designing reliable high-frequency components.

Purpose of the Study:

  • To experimentally determine the multipactor discharge threshold on dielectric surfaces at 110 GHz.
  • To investigate the influence of electric field polarization (parallel and perpendicular to the surface) on multipactor thresholds.
  • To compare experimental results with existing theoretical models and data at lower frequencies.

Main Methods:

  • Experimental measurements of multipactor discharge thresholds were conducted at 110 GHz using dielectric samples.
  • Two distinct geometries were employed: electric field parallel and perpendicular to the sample surface.
  • Radio frequency (rf) power dissipation during multipactor events was quantified.

Main Results:

  • Measured multipactor thresholds ranged from 15 to 34 MV/m, substantially higher than at conventional microwave frequencies.
  • Experimental thresholds showed a linear increase with frequency, consistent with theoretical predictions.
  • Low rf power dissipation (≤1%) was observed for the parallel electric field case, while very strong dissipation occurred in the perpendicular case.

Conclusions:

  • Experimental data strongly supports theoretical models for dielectric multipactor discharges across a range of frequencies.
  • The findings provide a robust foundation for predicting and mitigating multipactor effects in high-frequency systems.
  • Understanding the frequency and polarization dependence is key to advanced design in microwave and millimeter-wave applications.