access icon free Quality factor measurements of air-cored solenoids at overtone frequencies

Although Tesla transformers and helical cavity filters are employed in quite different technical areas, a previous contribution demonstrated that applying the techniques used in designing these filters to the secondary winding configurations of a Tesla transformer improved the spectral purity of the output. In the present reported work, measurements of the quality factors of the original and a number of modified secondary windings are shown to provide results at the fundamental and overtone frequencies, thereby illustrating the scale of the possible benefits that can be achieved.

Inspec keywords: Q-factor measurement; filters; transformer windings; solenoids

Other keywords: quality factor measurements; secondary winding configurations; helical cavity filters; overtone frequencies; air-cored solenoids; spectral purity; fundamental frequency; overtone frequency; filter design; modified secondary windings; Tesla transformers

Subjects: Filters and other networks; Other electric variables measurement; Inductors and transformers; Solenoids and electromagnets

References

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      • 1. Macalpine, W.W., Schildknecht, R.O.: ‘Coaxial resonators with helical inner conductor’. In Proc. IRE, New York, NY, USA, December 1959, pp. 20992105.
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      • 2. Vizmuller, P.: ‘Filters with helical and folded helical resonators’ (Artech House, Norwood, MA, USA, 1987).
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      • 3. Craven, R.M.: ‘A study of secondary winding designs for the two-coil Tesla transformer’. PhD thesis, Loughborough University, 2014.
http://iet.metastore.ingenta.com/content/journals/10.1049/el.2014.2241
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