Antenna with partially saturated dispersive ferromagnetic substrate

Antenna adapted to receive or emit at least one working frequency comprised in a kilometric (30-300 kHz), hectometric (0.3-3 MHz), decametric (3-30 MHz) and metric (30-300 MHz) band of frequencies, comprising:

• at least two non-ferrous metal plates extending mainly according to a horizontal plane, at least one first plate forming a radiating portion and a second plate forming a mass plane,
• at least one substrate extending mainly according to a horizontal plane, arranged between the mass plane and the radiating portion,
• an excitor of length at least equal to the thickness of the substrate, extending between the mass plane and the radiating portion and connected to the radiating portion, and adapted to supply the antenna,
• said antenna wherein the substrate is a dispersive ferromagnetic substrate, called dispersive ferrite, presenting at said at least one working frequency, as magnetic features, a high relative magnetic permeability comprised between 10 and 10,000 and a high magnetic loss tangent greater than 0.1, said antenna comprising local modification means of the magnetic features of the dispersive ferrite, such that the relative magnetic permeability and the magnetic losses of the dispersive ferrite are reduced gradually and locally.