Ka. Michalski, FORMULATION OF MIXED-POTENTIAL INTEGRAL-EQUATIONS FOR ARBITRARILY-SHAPED MICROSTRIP STRUCTURES WITH UNIAXIAL SUBSTRATES, Journal of electromagnetic waves and applications, 7(7), 1993, pp. 899-917
A systematic development is presented of three distinct mixed-potentia
l integral equations for the analysis of printed circuits, microstrip
resonators, and antennas embedded in multi-layered, planar, uniaxial m
edia of infinite lateral extent, with emphasis on microstrip structure
s comprising non-planar conductors of irregular or arbitrary shapes.