Currents and conduction losses in unilateral finline

The authors present a rigorous calculation of currents, conduction losses, and Q-factors of the fundamental and higher-order modes of a unilateral finline. The approach is based on a Ritz-Galerkin variational development of, first, the field in the fin gap in terms of functions which intrinsically satisfy the edge condition and, second, the currents in the fin also satisfying the same properties. Results show losses to be higher than previously estimated, and in very good agreement with experimental results