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Extrusion freeforming of millimeter wave electromagnetic bandgap (EBG) structures

Extrusion freeforming of millimeter wave electromagnetic bandgap (EBG) structures
Extrusion freeforming of millimeter wave electromagnetic bandgap (EBG) structures
Purpose – The aim of this paper is to provide an easy method of extrusion freeforming to fabricate microwave electromagnetic bandgap (EBG) crystals. EBG crystals are periodic dielectric structures that can block wave propagation and generate a bandgap. These crystals can be used in high capability antennae, electromagnetic wave semiconductors, microresonators, high-reflectivity mirrors and polarizing beam splitters.

Design/methodology/approach – The effects of extrusion process parameters and paste characteristics were investigated. Finally, one-period and two-period woodpile EBG crystals with bandgaps in the frequency region of 90-110?GHz were fabricated and the bandgap was measured.

Findings – The filament diameter is influenced by whether extrusion is carried out with or without a substrate and by the free fall-distance from the nozzle. The quality of lattice structures is dependent on paste flow and properties. A ceramic paste with 60?vol.?% (the fraction of ceramic powder based on solvent-free polymer) was well suited to fabrication. The solvent content also influenced the fabrication. The experimental results show that under ~12 per cent solvent mass fraction in the paste and relatively high extrusion ram velocity (more than 0.014?mm/s) at a pressure of 14?MPa, samples with high quality were fabricated.

Originality/value – This paper demonstrates that the rapid prototyping method of extrusion freeforming can be applied for the fabrication of EBG crystals from ceramic powders and the important factors which influence the product quality are identified.
rapid prototypes, ceramics, crystal structure, modelling
1355-2546
42-51
Lu, Xuesong
e3eb4386-7dc9-417e-bd5c-bbdec78f7ec5
Lee, Yoonjae
07298a68-0ff0-4a07-a4de-c4f5a6e0cd64
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Hao, Yang
8450eaa4-843c-4b86-b951-b413942d4453
Evans, Julian
bba57b06-0474-4cab-8c27-b15ca9355910
Parini, Clive
433f129d-86e6-449c-aeff-c22490f1c1db
Lu, Xuesong
e3eb4386-7dc9-417e-bd5c-bbdec78f7ec5
Lee, Yoonjae
07298a68-0ff0-4a07-a4de-c4f5a6e0cd64
Yang, Shoufeng
e0018adf-8123-4a54-b8dd-306c10ca48f1
Hao, Yang
8450eaa4-843c-4b86-b951-b413942d4453
Evans, Julian
bba57b06-0474-4cab-8c27-b15ca9355910
Parini, Clive
433f129d-86e6-449c-aeff-c22490f1c1db

Lu, Xuesong, Lee, Yoonjae, Yang, Shoufeng, Hao, Yang, Evans, Julian and Parini, Clive (2009) Extrusion freeforming of millimeter wave electromagnetic bandgap (EBG) structures. Rapid Prototyping Journal, 15 (1), 42-51. (doi:10.1108/13552540910925054).

Record type: Article

Abstract

Purpose – The aim of this paper is to provide an easy method of extrusion freeforming to fabricate microwave electromagnetic bandgap (EBG) crystals. EBG crystals are periodic dielectric structures that can block wave propagation and generate a bandgap. These crystals can be used in high capability antennae, electromagnetic wave semiconductors, microresonators, high-reflectivity mirrors and polarizing beam splitters.

Design/methodology/approach – The effects of extrusion process parameters and paste characteristics were investigated. Finally, one-period and two-period woodpile EBG crystals with bandgaps in the frequency region of 90-110?GHz were fabricated and the bandgap was measured.

Findings – The filament diameter is influenced by whether extrusion is carried out with or without a substrate and by the free fall-distance from the nozzle. The quality of lattice structures is dependent on paste flow and properties. A ceramic paste with 60?vol.?% (the fraction of ceramic powder based on solvent-free polymer) was well suited to fabrication. The solvent content also influenced the fabrication. The experimental results show that under ~12 per cent solvent mass fraction in the paste and relatively high extrusion ram velocity (more than 0.014?mm/s) at a pressure of 14?MPa, samples with high quality were fabricated.

Originality/value – This paper demonstrates that the rapid prototyping method of extrusion freeforming can be applied for the fabrication of EBG crystals from ceramic powders and the important factors which influence the product quality are identified.

Full text not available from this repository.

More information

Published date: 2009
Keywords: rapid prototypes, ceramics, crystal structure, modelling
Organisations: Engineering Mats & Surface Engineerg Gp

Identifiers

Local EPrints ID: 165005
URI: https://eprints.soton.ac.uk/id/eprint/165005
ISSN: 1355-2546
PURE UUID: 03c3fc9c-0a2f-4d3b-b45a-bbefeb44fec2
ORCID for Shoufeng Yang: ORCID iD orcid.org/0000-0002-3888-3211

Catalogue record

Date deposited: 07 Oct 2010 13:46
Last modified: 20 Jul 2019 00:46

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