Fabrication of Millimeter-Wave Electromagnetic Bandgap Crystals Using Microwave Dielectric Powders

Authors

Xuesong Lu, University College London
Yoonjae Lee, University of London
Shoufeng Yang, University of London
Yang Hao, University College London
Rick Ubic, Boise State UniversityFollow
Julian R. G. Evans, University College London
Clive G. Parini, University of London

Document Type

Article

Publication Date

2-1-2009

Abstract

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)O₃ and (Zr_0.8, Sn_0.2)TiO₄ and compared with those of Al₂O₃ 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.

Publication Information

Lu, Xuesong; Lee, Yoonjae; Yang, Shoufeng; Hao, Yang; Ubic, Rick; Evans, Julian R. G.; and Parini, Clive G.. (2009). "Fabrication of Millimeter-Wave Electromagnetic Bandgap Crystals Using Microwave Dielectric Powders". Journal of the American Ceramic Society, 92(2), 371-378. https://doi.org/10.1111/j.1551-2916.2008.02907.x