Abstract. Cylindrical mirror and
mirror - lens systems are used as radiating systems for multibeam antenna
arrays. In this case, the planar waveguide, in which the feed element is
located, makes a 180-degree turn and forms a two-layer structure, the second
floor of which is occupied by an array. Such a design is more compact than a
one-story one, in which the Rotman lens is usually used as a focusing element.
A two-mirror aplanatic system allows reducing aberrations and expanding the
scanning sector in comparison with a single-mirror one, however, for the
arrangement of the grating above the planar waveguide, one more rotation of the
planar waveguide is required, i.e. a transition to a three-mirror system is
necessary. This construction is considered in this paper. It is shown that the
third mirror allows reducing aberrations in comparison with the two-mirror
system. The work consists of two parts. In the first part, problems of
synthesis and minimization of aberrations of a cylindrical three-mirror
aplanatic system are considered. As a result of optimization of the parameters,
the angle of view of 100 degrees is realized. In the second part, the scanning
properties of a four-layer antenna based on a synthesized three-mirror system
were studied. The results of the experiment confirmed the size of the scanning
sector and the broadband properties of the multi-beam antenna based on a
synthesized three-mirror system.
Keywords: antennas, ultra-wideband,
multi-beam, three-mirror, planar.
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