SUPER-WIDE BAND BROADCASTING COATING Russian patent published in 2017 - IPC H01Q17/00 

FIELD: radio engineering, communication.

SUBSTANCE: invention relates to radio-absorbing coatings of electromagnetic waves (EMW), and can be used in ultra-wideband antenna systems. The ultra-wideband radio-absorbing coating is made in the form of a seven-layer coating based on ferromagnetic metal-polymer-matrix composite materials, whose layers have different thicknesses. The first layer is from 2.0 to 3.0 mm, the second layer from 1.0 to 1.5 mm, the third layer is from 1.0 to 2.0 mm, the fourth layer - from 3.0 to 4.0 mm, the fifth layer - from 2.0 to 3.0 mm, the sixth layer - from 1.0 to 1.5 mm, the seventh layer is from 0.1 to 0.5 mm. In each of the first five layers, a complex of ferromagnetic particles with various shapes and sizes is used as the filler: in the first layer (flake particles) from 5 to 25 mcm, in the second layer (flake particles) from 3 to 10 mcm, in the third layer (particles of spheroidal shape) from 1 to 5 mcm, in the fourth layer (particles of spheroidal shape) from 1 to 5 mcm, in the fifth layer (particles of spheroidal shape) from 1 to 5 mcm. The sixth coating layer is a matching dielectric layer with a reduced dielectric constant, achieved by introducing glass microspheres into the polymer matrix. The seventh low-thickness dielectric coating layer is an additional matching layer for the high-frequency region of the spectrum and is a polymer matrix with rheological additives.

EFFECT: use of a radio-absorbing coating in the system of ultra-wide-band spiral antennas has made it possible to reduce the ruggedness of the directivity diagrams of ultra-wide-band helical antennas placed on a metal platform to a level of 1,0-1,5 dB, to ensure the operation of the system of ultra-wide-band spiral antennas within the technical requirements.

1 dwg