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Parasitic high Q-factor open-box modes with 3-D printed dielectric-filled metal waveguides

Title: Parasitic high Q-factor open-box modes with 3-D printed dielectric-filled metal waveguides
Authors: Dawood, A
Lucyszyn, S
Item Type: Journal Article
Abstract: High Q-factor open-box mode resonances have been found in the microwave measurements of several 3-D printed dielectric-filled metal-pipe rectangular waveguides (MPRWGs). These parasitic Fabry-Pérot eigenmodes are confined by the conductive walls in the transverse plane of the MPRWG and partially confined by the air-dielectric and dielectric-air boundaries in the longitudinal direction. The excitation of open-box modes was previously speculated to be due to the inhomogeneities and/or anisotropic nature of the 3-D printed dielectric-fillers. This has now been confirmed, by representing the inhomogeneous and anisotropic nature of the woodpile-like dielectric structure (physical realm), with an anisotropic dielectric constant tensor (simulation realm). Analytical and numerical eigenmode solvers, previously used by the authors with MPRWGs, are applied here to parallel-plate waveguides (PPWGs) and circular waveguides (CWGs); identifying all the individual parasitic open-box modes. With the former, its TM11 mode exhibits an ultra-high Q-factor of approximately 2,300 at X-band, which is considerably higher than those found with other modes and in other waveguide structures. Finally, a numerical full-wave frequency-domain simulator that employs the dielectric constant tensor is introduced in this paper. This new modeling technique independently confirms that open-box modes are excited in 3-D printed dielectric-filled MPRWG, PPWG and CWG structures. This paper provides the foundations for accurately modeling parasitic resonances associated with inhomogeneities and anisotropy in 3-D printed microwave components; not just the metal-walled waveguide structures considered here, but the methodology could also be extended to generic 3-D printed dielectric waveguides and substrate-based transmission lines.
Issue Date: 10-Sep-2021
Date of Acceptance: 8-Sep-2021
URI: http://hdl.handle.net/10044/1/91677
DOI: 10.1109/ACCESS.2021.3111959
ISSN: 2169-3536
Publisher: Institute of Electrical and Electronics Engineers
Start Page: 134319
End Page: 134334
Journal / Book Title: IEEE Access
Volume: 9
Copyright Statement: © 2021 The Author(s). This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: UK Space Agency
Funder's Grant Number: CT11834
Keywords: 08 Information and Computing Sciences
09 Engineering
10 Technology
Publication Status: Published online
Article Number: Access-2021-30349
Online Publication Date: 2021-09-10
Appears in Collections:Electrical and Electronic Engineering
Faculty of Engineering

This item is licensed under a Creative Commons License Creative Commons