Composite material with controllable resonant cells

The equipment (100) for controlling propagation of the entering electromagnetic radiation (110) is explained, and this equipment includes the composite material (102) which has an electromagnetism response cell (106) of a small size compared with the wavelength of the entering electromagnetic radiation (110). At least 1 side of the capacitivity and inductivity of at least one cell in an electromagnetism response cell (106) is controlled in time, and it enables it to control in time the related effective index which acts on the electromagnetic radiation (110) which enters while spreading the inside of a composite material (106).