3D Radiating and Focusing Antenna System

The 3D antenna system focusing the radiation in a far zone based on the linear array consisting of declining semitransparent plane arrays is examined in paper. The quasioptical conditions are fulfilled for the system's geometry. The distance between separate elements of system satisfies to the Fresnel zone conditions, and the radiation pattern (RP) of system is calculated in its far zone. The separation of variables is assumed in the apertures of separate elements and in the RP's components. The explicit formulas are derived for the field values in the constituent elements of antenna and created RP. The ability of system to create the RPs of the different kind is supported by computations.

I. Introduction

The quasi-optical conditions are promising tool in the process of investigation of the electromagnetic problems related to antennas and arrays, communication systems, plasma application, and material characterization. The above conditions are based on the geometrical theory of diffraction and they make possible to get the solutions of electromagnetic (EM) wave scattering problem in the case when the size of structure under investigation is large in the comparison to the length of wave. There is a numerous literature related to this topic (see as example books [1]–[3] and papers [4]–[6]).