Tubular capacitors

Fig. 5.9 Longitudinal section showing silvering of a tubular capacitor.

The capacitance of tubular capacitors can also be calculated using Eq. (2.71). 

Lead and electrode inductance can be somewhat less in discs than in tubes so that discs have some advantage at higher frequencies. The two shapes are similar in volumetric efficiency since their bulk largely consists of the encapsulating resin. The tubular geometry is suited to the manufacture of feed-through capacitors. A schematic diagram of the cross-section of such a capacitor is shown in Fig. 5.10. These are used as bypass capacitors in television and FM tuners. 

Luminaire for tubular fluorescent lamps, increased safety, encapsulated series reactor, flameproof power factor capacitor ... 

Banerjee, P., I. Perez, L. Henn-Lecordier, S. B. Lee, and G. W. Rubloff. 2009. Nano tubular metal-insulator-metal capacitor arrays for energy storage. Nature Nanotechnology 4 292-296. 

Qu, W. H., R Han, A. H. Lu, C. Xing, M. Qiao, and W. C. Li. 2014. Combination of a SnOj-C hybrid anode and a tubular mesoporous carbon cathode in a high energy density non-aqueous lithium ion capacitor Preparation and characterisation. Journal of Materials Chemistry A 2 6549-6557. 

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