In this paper, an analytical expression for the characteristic impedance of a microstrip line in presence of a dielectric cover is presented. Assuming a quasi-TEM propagation mode, a rigorous conformal mapping based on the Schwarz-Christoffel transformation is employed to derive the equivalent capacitance model, which can then be applied to derive a closed analytical expression for the effective permittivity and the characteristic impedance of the line. Such a formulation is not limited to the case of a single cover layer, but an arbitrary number of electric overlays can be considered as well. Comparisons with published numerical results and full-wave simulations in the case of a single cover layer have been also performed to test the validity of the proposed approach.
Barbuto, M., Alù, A., Bilotti, F., Toscano, A., Vegni, L. (2013). Characteristic impedance of a microstrip line with a dielectric overlay. COMPEL, 32(6), 1855-1867 [10.1108/COMPEL-10-2012-0283].
Characteristic impedance of a microstrip line with a dielectric overlay
BARBUTO, MIRKO;BILOTTI, FILIBERTO;TOSCANO, ALESSANDRO;VEGNI, Lucio
2013-01-01
Abstract
In this paper, an analytical expression for the characteristic impedance of a microstrip line in presence of a dielectric cover is presented. Assuming a quasi-TEM propagation mode, a rigorous conformal mapping based on the Schwarz-Christoffel transformation is employed to derive the equivalent capacitance model, which can then be applied to derive a closed analytical expression for the effective permittivity and the characteristic impedance of the line. Such a formulation is not limited to the case of a single cover layer, but an arbitrary number of electric overlays can be considered as well. Comparisons with published numerical results and full-wave simulations in the case of a single cover layer have been also performed to test the validity of the proposed approach.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.