Low-Loss 3D-Printed Waveguide Filters Based on Deformed Dual-Mode Cavity Resonators

Michał Baranowski; Łukasz Balewski; Adam Lamęcki; Michał Mrozowski

doi:10.1109/access.2024.3408671

Low-Loss 3D-Printed Waveguide Filters Based on Deformed Dual-Mode Cavity Resonators

Abstract

This paper introduces a new type of waveguide filter with smooth profile, based on specially designed dual-mode (DM) cavity resonators. The DM cavity design is achieved by applying a shape deformation scheme. The coupling between the two orthogonal cavity modes is implemented by breaking the symmetry of the structure, thus eliminating the need for additional coupling elements. The modes operating in the cavity are carefully analyzed and a scheme for managing the spurious modes is discussed. Two filter prototypes employing the designed DM cavities are developed and described in detail. The first design is a fourth-order bandpass filter (BPF) with a 90◦ rotated output and a transmission zero (TZ), whereas the second design is an eighth-order filter with four TZs. Both designs are developed, taking into account the limitations of 3D printing technology to enable their single-piece fabrication without internal supports. The structures benefit from additive manufacturing (AM) by having a smooth surface profile and reduced weight, which is often highly desirable for high-power and low-loss applications. Filter prototypes were manufactured using selective laser melting (SLM) from aluminum alloy and tested to validate the designs. Measurement results are consistent with the simulation and prove the validity of the proposed solutions. Both measured BPF prototypes demonstrate low insertion loss, i.e., 0.11 dB and 0.25 dB for the fourth-order and eighthorder designs, respectively. The estimated Q-factors reach 3500 and 4500, which is a very good result for 3D-printed parts.

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Authors (4)

Michał Baranowski mgr inż.
Łukasz Balewski dr. inż.
- EM Invent Sp. z o.o.
Adam Lamęcki dr hab. inż.
Michał Mrozowski prof. dr hab. inż.

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DOI:: Digital Object Identifier (open in new tab) 10.1109/ACCESS.2024.3408671
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Keywords

ADDITIVE MANUFACTURING, DESIGN OPTIMIZATION, DUAL-MODE CAVITY RESONATOR, DUAL-MODE WAVEGUIDE FILTER, SHAPE DEFORMATION.

Details

Category:

Articles

Type:

artykuły w czasopismach

Published in:

IEEE Access no. 12, pages 78275 - 78285,
ISSN: 2169-3536

Language:

English

Publication year:

2024

Bibliographic description:

Baranowski M., Balewski Ł., Lamęcki A., Mrozowski M.: Low-Loss 3D-Printed Waveguide Filters Based on Deformed Dual-Mode Cavity Resonators// IEEE Access -, (2024), s.78275-78285

DOI: