On the Development of Metal 3D Printed Bandpass Filter With Wide Stopband Based on Deformed Elliptical Cavity Resonator With an Additional Plate

Povilas Vaitukaitis, Kenneth Nai, Jiayu Rao, Jiasheng Hong

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Abstract

This paper presents a newly developed metal 3D printed waveguide bandpass filter based on a modified deformed elliptical cavity resonator with an additional plate. The modified resonator has excellent design freedom allowing semi-independent control of centre frequency, bandwidth, and transmission zeros. Furthermore, transmission zeros can be placed close and far from the passband to improve frequency selectivity and stopband’s width and rejection, respectively. Theory of the resonator, filter design with an example, and simulated and experimental results with extensive discussion are given. As proof of concept, a 5-pole Ku-band wideband filter was designed and manufactured using Selective Laser Melting, a metal 3D printing technique. Even though the prototypes were tested as-built, i.e. without any surface post-processing, the simulated and measured results have good agreement and consistency between all four printed prototypes. Moreover, the prototypes were manufactured in one piece, significantly improving measured results compared to the previous two-piece prototypes.
Original languageEnglish
Pages (from-to)15427-15435
Number of pages9
JournalIEEE Access
Volume10
Early online date31 Jan 2022
DOIs
Publication statusPublished - 11 Feb 2022

Keywords

  • Deformed cavity resonator
  • metal 3D printing
  • selective laser melting
  • waveguide filter
  • wide stopband
  • wideband bandpass filter

ASJC Scopus subject areas

  • Computer Science(all)
  • Materials Science(all)
  • Engineering(all)

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