DEVELOPING APPLIED APPLICATIONS FOR THE CALCULATION AND DESIGN OF HORN AND HORN-LENS ANTENNAE IN THE SOFTWARE ENVIRONMENT FEKO

Abstract

Development, calculation, analysis of ground-based and airborne antenna systems is im- possible without using new automatic design tools. The systems of automatic design are an important instrument for each design engineer of microwave technique and antennae. To solve modern tasks, more improved software, as well as a continuous study of new methods and ap- proaches are required.

A software application package for calculating and design of a pyramidal horn and horn- lens antennae with the FEKO program “FEldberechnung bei Korpern mit beliebiger Oberflache” (calculation of the field based on solids of arbitrary form) in the frequency ranges 500... 800 MHz, 760 MHz...1,46 GHz, 1,45...2,20 GHz, 2,17...5 GHz, 4,64...10 GHz is devel-

oped. One of the most powerful modern programs of electrodynamic simulation, the FEKO is described, which represents a new approach to the design of three-dimensional microwave devices. The operation principle of a horn and horn-lens antennae is described. The possibility of the phase correction in the aperture of the horn by using a slowing lens is studied. The pro- posed technique of designing horn and horn-lens antennae in the software environment FEKO allows to vary the input data and calculate and design the antennae at a given frequency. The current distribution calculation is carried out, whose results allow to display the distribution at a specific frequency from a given frequency range and the place of the greatest concentration of currents is also defined. The near field and the far field of horn and horn-lens antennae is calculated for a frequency f = 1,575 GHz, and displayed. The calculation results are displayed as graphs. The pattern of the mentioned antennae in the E and H planes for the Cartesian, polar, logarithmic coordinate systems and the three-dimensional form are presented. The value of the main lobe of the pattern at half power of a horn and horn-lens antennae are calculated. The frequency dependence of the standing wave ratio of the voltage (VSWR) and the gain of these antennae in the range 1,45...2,20 GHz are presented.