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Area of Science:

  • Electromagnetics
  • Materials Science
  • Additive Manufacturing

Background:

  • Transformation optics (TO) offers a theoretical framework for manipulating electromagnetic fields.
  • Controlling electromagnetic field flow between sections of different dimensions is crucial for device miniaturization and performance.

Purpose of the Study:

  • To design and validate a broadband electromagnetic field taper using transformation optics.
  • To demonstrate the feasibility of fabricating such a device using low-cost, all-dielectric materials and additive manufacturing.

Main Methods:

  • The study employed transformation optics principles to design a graded permittivity profile for the taper.
  • Three-dimensional (3D) polyjet printing technology was utilized for device fabrication with all-dielectric materials.
  • Numerical simulations (full-wave) and experimental measurements were conducted to validate the taper's performance.

Main Results:

  • The broadband performance of the electromagnetic field taper was successfully validated both numerically and experimentally.
  • Near-field mappings from simulations and experiments showed good qualitative agreement, confirming the taper's functionality.
  • The fabricated all-dielectric taper demonstrated effective control over electromagnetic field flow.

Conclusions:

  • The developed all-dielectric taper, based on transformation optics and fabricated via 3D printing, effectively controls electromagnetic fields.
  • This approach provides a low-cost and scalable method for creating novel microwave devices.
  • The successful validation opens avenues for practical applications in microwave engineering.