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posted on 07.02.2022, 03:38 by Michal BaranowskiMichal Baranowski, Łukasz Balewski, Adam Lamecki, Michal MrozowskiMichal Mrozowski, Jaione GaldeanoThis paper introduces shape deformation as a new
approach to the computer-aided design (CAD) of high-frequency
components. We show that geometry deformation opens up new
design possibilities and offers additional degrees of freedom in
the 3D modeling of microwave structures. Such design flexibility
is highly desirable if the full potential of Additive Manufacturing
(AM) is to be exploited in the fabrication of RF & microwave
devices. The use of deformation techniques in the design of high-frequency components allows the attainment of improved electrical parameters, such as high-quality factors for cavity resonators
and wide higher-order mode separation. In this work, shape
deformation with radial basis functions (RBFs) is integrated
with an electromagnetic field simulator based on the 3D finite-element method (FEM), allowing the semiautomated optimization
of microwave components, such as cavity resonators and filters.
The proposed strategy is used for the design of high Q-factor
cavity resonators and of cavity bandpass filters with improved
spurious mode separation. Designs of third-order and sixth-order
cavity filters with complex geometry are experimentally verified
using 3D-printed prototypes with selective laser melting (SLM)
technology.