Computation of Intra- and Inter- Winding Capacitances in a High Frequency Coaxial Transformer with Faraday Shield
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The placement and thickness of the Faraday shield in a high-frequency coaxial transformer (HFCT) has to be optimized as it has a significant influence on the intra- and inter- capacitances. This paper presents the parasitic capacitance matrix of a HFCT with and without a shield calculated by the Finite Element method. A capacitance formula is developed for the HF equivalent circuit. The simulation results demonstrate that the insertion loss caused by the shield can be neglected, and the intra-capacitance is almost reduced to zero if the shield is grounded properly. The calculated inter-capacitance of the HFCT is in good agreement with the experimental result. An optimized winding arrangement is used to minimize the power loss in the HFCT.
Proceedings of IEEE CEFC2008
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Electrical and Electronic Engineering not elsewhere classified