V. V. Chebyshev - Dr.Sc. (Eng.), Professor, Head of Department of Technical Electrodynamics and Antennas, Moscow Technical University of Communication and Informatics

The method of the integral equations is offered as a basis for numerical microstrip antennas designing as well in the form of planar strip structures as in the form of narrow strip structures of any geometry. The method is the transition from a strict electrodynamic problem to the integral equations of the first kind for surface currents of strip antennas. Universal and effective algorithms of numerical research are offered on its basis. The algorithms consider a feature of the integral equation kernels and realize the collocations method. For antennas in the form of narrow strip structures the algorithm of numerical research realizes a principle of self-regulation and assumes the using of arbitrary interpolation of antennas currents, in particular quadratic interpolation, as the most effective at the calculation of extended strip structures. Discretization of the integral equations leads to the system of the linear algebraic equations. Its matrix is well-conditioned due to the predominance of the matrix diagonal elements so the matrix inversion does not cause difficulties. The numerical research examples of spiral antennas in the form of narrow strip conductors and planar strip resonator antennas are given.