"JOURNAL OF RADIO ELECTRONICS" (Zhurnal Radioelektroniki ISSN 1684-1719, N 9, 2018

contents of issue      DOI  10.30898/1684-1719.2018.9.13     full text in Russian (pdf)  

Synthesis and analysis of bifocal two-mirrow systems

V. A. Kaloshin, D. T. Le

1 Kotelnikov Institute of Radioengineering and Electronics of Russian Academy of Sciences, Mokhovaya 11-7, Moscow 125009, Russia
Moscow Institute of Physics and Technology (State University), 9 Institutsky Per., Dolgoprudny, Moscow region 141700, .Russia


The paper is received on September 4, 2018


Abstract. A technique is developed for the synthesis of bifocal two-mirror systems that convert two divergent cylindrical waves into convergent or flat ones. The technique is based on the well-known approach with setting the initial portion of the mirrors surface and sequentially finding other areas. The technique ensures the smoothness of the obtained solution. As an example, we synthesized two variants of bifocal two-mirror systems with different sets of parameters and an analysis of their aberrations. Analysis of aberrations showed that the lens, which forms flat fronts at the output, has a mean-square aberration 5.10-4, and for a lens with symmetrical focal curves it is 3.5.10-3.Using the finite element method, a numerical study of the scanning characteristics of a planar bifocal two-mirror antenna was carried out. A numerical experiment was performed to confirm the scanning properties of the synthesized two-mirror systems. A cylindrical two-mirror antenna with a width of 160 mm and a height of 1.7 mm was located inside a planar metal waveguide of the same height and was excited by an H- sectorial horn with an input section of 7.2 × 1.7 mm and an output cross-section of 14 × 1.7 mm at a frequency of 37.5 GHz. The geometry of the focal curve was obtained by optimization by the criterion of maximum gain. In this case, the direction of the axis of the horn radiator was also optimized. Losses in metal were not taken into account in the calculation. The antenna efficiency is more than 0.8 in the sector of angles ± 25 degrees.

Key words: two-mirror systems, bifocal systems, planar antennas, aberrations, scanning.


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For citation:
V. A. Kaloshin, D. T. Le. Synthesis and analysis of bifocal two-mirrow systems. Zhurnal Radioelektroniki - Journal of Radio Electronics. 2018. No. 9. Available at http://jre.cplire.ru/jre/sep18/13/text.pdf

DOI  10.30898/1684-1719.2018.9.13