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A wideband coaxial-to-waveguide transition devised with topology optimization.

Md Sazzad Hossain1, Jane M Lehr2, Andrew Fierro2

  • 1Department of Electrical Engineering, University of New Mexico, Albuquerque, NM, 87606, USA. mhossa23@ncsu.edu.

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Topology optimization enhanced a patch antenna

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Area of Science:

  • Electromagnetics
  • Antenna Design
  • Computational Engineering

Background:

  • Topology optimization (TO) is typically used in structural mechanics.
  • Its application in electromagnetics, particularly for resonant RF components, presents unique challenges.
  • Frequency agile mode converters require precise optimization.

Purpose of the Study:

  • To apply topology optimization to a coaxial-to-rectangular waveguide converter.
  • To enhance the bandwidth of a patch antenna with a ground stop using TO.
  • To verify the performance of the optimized structure in the X-band frequency range.

Main Methods:

  • The design was transformed into a binary material distribution matrix.
  • A Binary Particle Swarm Optimization (BPSO) algorithm was used to alter cell values.
  • The optimization targeted increased operating band width for RF components.

Main Results:

  • The topology optimization resulted in a complex structure.
  • The optimized patch antenna achieved a 38% larger bandwidth compared to the control design.
  • The fabricated structure's performance was verified between 8-12 GHz.

Conclusions:

  • Topology optimization is effective for enhancing RF component performance.
  • The TO framework can be successfully applied to electromagnetic problems like waveguide converters.
  • This method offers a significant improvement in antenna bandwidth.