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Fabrication of Millimeter‐Wave Electromagnetic Bandgap Crystals Using Microwave Dielectric Powders
Author(s) -
Lu Xuesong,
Lee Yoonjae,
Yang Shoufeng,
Hao Yang,
Ubic Rick,
Evans Julian R. G.,
Parini Clive G.
Publication year - 2009
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2008.02907.x
Subject(s) - materials science , dielectric , ceramic , band gap , fabrication , microwave , extremely high frequency , photonic crystal , composite material , machining , optoelectronics , rapid prototyping , optics , metallurgy , computer science , medicine , telecommunications , alternative medicine , physics , pathology
Electromagnetic bandgap (EBG) structures active in the 90–110 GHz region widely used by security imaging radar were created using different ceramics by a rapid prototyping method informed by finite difference time domain modeling. This solid free‐forming method uses a high volatility solvent‐based ceramic paste extruded through fine nozzles allowing ceramic powders to be assembled on a multiaxis building platform avoiding machining, etching, or the alignment of loose rods and created to designs downloaded directly from a computer file. Lattices were made from two high dielectric constant ceramics: La(Mg 0.5 , Ti 0.5 )O 3 and (Zr 0.8 , Sn 0.2 )TiO 4 and compared with those of Al 2 O 3 demonstrating three EBG structures with different dimensions and dielectric constants but with the same bandgap. The effects of manufacturing tolerances on bandgap frequency are investigated by simulation.