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A 3D-Printed Bent-Twisted Waveguide Filter Using Mixed TE101 and TE102 Mode Resonators.

Lei Wang1, Mengke Bai2, Jun Xu2

  • 1The 54th Research Institute of CETC, Shijiazhuang 050081, China.

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|March 27, 2025
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Summary

This study introduces a novel waveguide bandpass filter combining bending and twisting using mixed TE101 and TE102 mode resonators. The filter achieves excellent stopband suppression, low insertion loss, and polarization rotation, validated by fabrication and testing.

Keywords:
3D printingbent–twisted waveguide filterwaveguide bandpass filter

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Microwave Engineering

Background:

  • Waveguide filters are crucial components in microwave systems.
  • Integrating multi-functional capabilities like bending and polarization rotation into filters is challenging.
  • Existing designs often compromise performance for added functionality.

Purpose of the Study:

  • To design and demonstrate a compact waveguide bandpass filter with integrated bending and polarization rotation.
  • To achieve high stopband suppression and low insertion loss using mixed-mode resonators.
  • To validate the design through fabrication and experimental measurements.

Main Methods:

  • Utilized a mixed-mode resonator approach employing both TE101 and TE102 modes.
  • Designed a sixth-order Chebyshev bandpass filter centered at 20.4 GHz.
  • Fabricated the prototype using stereolithography (SLA) and electroplating for metallization.

Main Results:

  • Achieved a 1.6 GHz bandwidth (7.84% fractional bandwidth) with over 20 dB return loss.
  • Demonstrated 120° bending in propagation and 90° polarization rotation.
  • Experimental measurements showed excellent agreement with simulation results.

Conclusions:

  • The mixed-mode resonator approach is effective for creating multifunctional waveguide filters.
  • The developed filter offers a compact and lightweight solution for integrated microwave systems.
  • This design paves the way for advanced, space-saving microwave circuit implementations.