A novel technique of broadbanding a helical slow-wave structure through negative dispersion shaping is proposed. The model considers a simple continuous chiral dielectric support for the helix inside a metallic barrel, unlike conventional helix slow-wave structures with three discrete dielectric supports at 120 0 apart. The dispersion relation of the slow-wave structure was derived following sheath-helix abstraction, suitably benchmarked for special cases, and was used for analyzing the dispersion behavior of a typical slow-wave structure. Chiral dielectric loading could easily provide negative dispersion characteristics (required for broadband operation) by merely controlling the chirality parameter alone. The scheme with its simple geometric configuration is expected to be useful for millimeter-wave devices providing better thermal management.
The purpose of this article is to review the use of fiber reinforced composites in fixed partial dentures. Fiber reinforced materials have highly favourable mechanical properties and their strength to weight ratios are superior to those of most alloys. When compared to metals they offer many other advantages as well, including non-corrosiveness, translucency, good bonding properties and ease of repair. They also offer the potential for chairside and laboratory fabrication.
How to cite this article
Ashwini W, Veena SP, Swati B. An overview of fiber reinforced composites used in fixed partial dentures. CODS J Dent 2015;7:23-27
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