RESULTS OF NUMERICAL STUDY OF SCATTERING CHARACTERISTICS IN ANTENNA RADOMES BASED ON METAL-DIELECTRIC GRATINGS

Abstract

Mathematical model of multilayered printed frequency selective surfaces with dielectric covers
is presented in this paper. The model is built on the suggestion of array infinity and perfect
conductivity of microstrip elements. Such printed structures can be used as frequency selective
surface and as covers with controllable characteristics (for example tunable filters, adaptive radar
cover, electronically switched polarizers). Full-wave analysis is executed by the integral equation
method of electromagnetics. The numerical solution of an integral equation has been obtained by
Galerkin’s method. Unknown distribution of surface magnetic currents has been approximated by
roof-top basic functions. The generalized scattering matrix method was used for simulation of
multilayered printed frequency selective surface. The paper presents the compound algorithm
which combines the integral equation method with the method of generalized scattering matrix. A
lot of numerical examples are presented proving the algorithm effectiveness. By means of this
model there were synthesized multilayer frequency selective surface as periodic arrays of the
printed elements, which have arbitrary shape of reradiators. It is known, that the printed elements
of special shape ensure, as rejecting and as transacting of electromagnetic waves in the given
frequencies, and have neglected angular sensitivity. The results of constructive synthesis of printed
frequency selective surfaces as rejecting or transmitting filters, which have neglected angular
sensitivity, are represented in paper. Such an algorithm is rather flexible and multiple repeats the
basic problem solution. It makes the procedure of computer code preparing much more effective
and do not require to change the problem decision itself.