Extrusion Freeforming of Millimeter-Wave Electromagnetic Bandgap (EBG) Photonic Crystals |
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| Authors: | Xuesong Lu Yoonjae Lee Shoufeng Yang Yang Hao Julian RG Evans Clive G Parini |
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| Institution: | 1. Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK;2. Department of Electronic Engineering, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;3. Department of Materials, Queen Mary, University of London, Mile End Road, London E1 4NS, UK |
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| Abstract: | Extrusion freeforming can be used for the rapid prototyping of millimeter-wave electromagnetic bandgap (EBG) structures. In this work, an alumina-polymer paste with a relatively high volatility solvent (propanol) was used and the characteristics of the ceramic paste, particularly the rheological features are described. The advantage of high volatility solvent is that the viscosity and elastic modulus of the paste are increased sharply as the solvent evaporates. Thus, the rigidity of the extruded filament is quickly increased as a small amount of solvent evaporates. Finally, by employing this procedure, different EBG structures such as 2-D, 3-D woodpile and aperiodic structures were fabricated and their bandgaps were measured. The experimental results show that extrusion freeforming is a relatively simple and easy method to fabricate these woodpile structures with a bandgap in the 90–110 GHz region. |
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