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Does defocusing a multibeam hybrid-mirror antenna reduce the number of feeds?

DOI 10.18127/j19998465-201812-03


A.G. Romanov – Ph.D.(Eng.), Main Designer, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
N.A. Testoedov – Dr.Sc.(Eng.), Corresponding Member of RAS, Professor,
JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
V.V. Mochalov – Leading Engineer, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
I.Yu. Danilov – Ph.D.(Eng.), Head of Department, JSC Academician M.F. Reshetnev «ISS» (Zheleznogorsk)
Yu.I. Choni – Ph.D.(Eng.), Associate Professor, Kazan National Research Technical University named after A.N. Tupolev

The assessment of the feasibility of defocusing a large-sized multibeam hybrid-mirror antenna (MHMA), that is, the displacement of the antenna array web (AAW) from the focus, in the interests of rarefaction of the AAW, is considered. It is noted that the characteristics of the MHMA were calculated using a high-performance simulation program, the consistency of which is confirmed by comparison with the data of other authors. It is shown that the results of multivariate calculations performed with the two cluster formation strategies indicate that the seemingly tempting idea of defocusing does not benefit from the gain of the rays in comparison with the non-displaced AAW and is not effective in this regard. First, in any method of cluster formation, defocusing does not introduce a noticeable gain compared with the arrangement of the antenna web in the focal plane. Secondly, it is clear that the decrease in the gain of the rays, which is manifested by dilution of the AAW, can be compensated for by moving from elements designed for a 100 mm cell to elements adapted to increased cell sizes. However, the relative change in the gain when the plane of the antenna web is shifted does not depend on the factor noted above.

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