Results are given for observations of the active region NOAA 12303, executed during the partial solar eclipse in March 20, 2015 into two observatories – "Svetloe" near to St. Petersburg and "Zelenchuksky", in the North Caucasus. Use a completely steerable paraboloids of radio telescopes RT-32 with a field of view, limiting the contribution of the quiet Sun, has led to increase of sensitivity and the effective angular resolution of eclipse observations (about 1–3 arcsec at microwaves 3.5, 6.2 and 13 cm). The thin structure of radio images is revealed and explaned in the context of the cyclotron emission theory.