Dielectric waveguide structures with surface controlled impedance

Gigoyan, Suren; Wu, Ke

doi:10.1109/rawcon.2004.1389142

Cited by 1 publication

(1 citation statement)

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“…The finite difference time domain (FDTD) method was used to simulate the millimetre wave transmission characteristics of the EBG structure in order to establish this design. The dielectric constant (ε r ) of alumina used in the simulation was 9.6 (90-100 GHz) (Afsar et al 1985, Gigoyan et al 2004. Measurements on sintered discs by the cavity resonator method (conducted at Manchester Metropolitan University) gave a value of 9.2 at 75-110 GHz.…”

Section: Fabrication Processmentioning

confidence: 99%

Fabrication and evaluation of solid freeformed electromagnetic bandgap structures

Lu¹,

Lee²,

Yang³

et al. 2009

J. Phys. D: Appl. Phys.

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Microwave electromagnetic bandgap (EBG) structures have potential applications in improving the radiating features of antennas and the transmission properties of waveguides. Extrusion freeforming is a rapid prototyping technique for assembling ceramic dielectric lattice structures directly from a computer design file. It is without heating, cooling or polymerization processes to contend with at the construction stage. Various limitations on overall build thickness prompted us to explore lamination by welding to produce larger three-dimensional quasi-crystals. Microwave transmission through normal and side incidence showed that the bandgap frequency was in the 90–110 GHz region in all directions, matching the design that was informed by computer modelling. In order to image the EBG internal crystal structure, micro-computed tomography was used for scanning and reconstruction. Finally, the effect of structural defects including roundness and sagging of filaments and deviation of inter-filament spacing caused by fabrication errors on bandgap frequency was investigated.

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Section: Fabrication Processmentioning

confidence: 99%