V. V. Chebyshev - Dr.Sc. (Eng.), Professor, Head of Department of Technical Electrodynamics and Antennas, Moscow Technical University of Communication and Informatics
O. I. Yastrebtsova - Post-graduate Student, Moscow Technical University of Communication and Informatics

Mathematical simulation of microstrip radiators in the form of Archimedean spiral on layered substrate with the loaded screen based on the use of the 1-st kind integral-differential equation for the spiral current has been considered. The integral equation kernel depends on the properties of the layered substrate and the loaded screen. The loaded screen is characterized by surface impedance. Its realization is supposed in the sense of "sided" impedance boundary conditions. The factors expanding a frequency range of the spiral antennae have been specified. Bases for constructing algorithms for the numerical solution of the equations have been brought. Numerical research examples of the equations for various topology of layered substrates have been given.