The Spaceflight101 article AngoSat-1 Satellite Overview Shows several images of the large communication satellite designed for GEO.
Two color photos show that the spacectraft has two large (roughly 3 meter diameter) flat circular disks on opposite sides of the spacecraft.
The monochrome image is one I've produced by showing Red minus Green with levels between -0.15 and 0.0 scaled to full black to while. This brings out more clearly a strange pattern produced by about 20 circles arranged in a square, plus a central hexagon surrounded by six hexagons around it.
As shown, if one faces the Earth, the other will face away from the Earth.
They don't look like they will become parabolic dishes, but instead remain flat.
What are they? How do they work?
below: From Spaceflight101. Credit: Roscosmos
below: From Spaceflight101. Credit: RSC Energia