A modular transmission line/reluctance head model

A transmission line model for calculating recording-head fields and efficiencies is described. Exact solutions are obtained for transmission line segments with fixed or varying gap and width. Using these solutions. Thevenin T-reluctance circuit equivalents are obtained for each segment of the total head transmission line structure, and the magnetic flux and fields are obtained by circuit analysis. External fringe fields at edges are also included. Using three basic building blocks: (1) constant-gap, variable or fixed-width regions, (2) graded-gap, variable or fixed-width regions, and (3) external fringe reluctances, in any number and sequence, virtually any head geometry can be quickly and reasonably modeled, without the need for reformulating the problem or respecifying boundary conditions