Modeling of a horn-based lattice based on field distribution in the plane of aperture of the horn

The method for the approximate simulation thrust antennas in EHF frequencies where direct modeling with the help of the software packages is complicated due to the demanding computing possibilities of computers is proposed. The proposed method is based on the restoration of the far field distribution of the field in the plane of the aperture of the horn. The horn antenna which was applied to researches, represents a horn lattice which is the part of the pyramidal loud-hailer with sizes in aperture 12,4*12,4+0,01 mm, and a disclosure corner 17°30’, and also four sectoral loudhailers 3,8 ± 0,01 mm wide and a corner aperture 17°30’. The thickness of the wall of a loud-hailer of 1,1+0,1 mm, radius of interface of walls of 0,1 mm. The distance between axes of lateral loud-hailers is 17 ± 0,01 mm. High precision of an arrangement of loud-hailers is necessary for ensuring electric parameters and formation of differential and total directional patterns. The following operating modes of the antenna from the horn lattice are possible: simultaneous reception-transmission of a signal with various polarization at different frequencies; signal transmission with various polarization at one frequency; signal reception with various polarization at one frequency. First of all, the irradiator directional pattern is characterized by the sizes of aperture loud-hailers and their electric characteristics, and also frequency characteristics of given waves. The paper applies the analysis of individual elements of the lattice in the software package CST Microwve Studio and subsequent treatment of the resulting field distribution in the lattice points to restore the far field.