Process of making synthetic magnetodielectric with controlled off-normal TE and TM response

A method for forming a synthetic magneto-dielectric composite material for absorbing/transmitting electromagnetic radiation, the method comprising the steps of:

• a) providing a sheet of fabric formed of an insulating material, the sheet having first and second surfaces;
• b) placing magnetically permeable thread into the fabric and removing those portions of the magnetically permeable thread which are disposed proximate the first and second surfaces of the fabric so as to define a plurality of magnetically permeable elements, the magnetically permeable thread comprising a material having a permeability greater than the permeability of free space;
• c) impregnating the fabric with resin;
• and
• d) curing the resin impregnated fabric;
• e) wherein the magnetically permeable thread is configured to provide predetermined off-normal TE and TM response within a selected frequency range, so as to provide desired absorption/transmission of electromagnetic radiation.

A method for forming a electromagnetic radiation absorbing/transmitting composite structure, the method comprising the steps of:

• a) providing a sheet of fabric having first and second surfaces, the fabric being formed of an insulating material;
• b) placing magnetically permeable thread into the fabric, the magnetically permeable thread having a permeability greater than the permeability of free space;
• c) removing portions of the thread proximate the first surface of the fabric;
• d) impregnating the fabric with resin;
• e) adding the resin impregnated fabric to a pre-existing composite structure with the first surface of the resin impregnated fabric contacting the pre-existing composite structure;
• f) curing the resin impregnated fabric;
• and
• g) removing portions of the thread proximate the second surface of the fabric;
• h) wherein removing portions of the thread proximate the first and second surfaces of the fabric defines magnetically permeable elements dispose generally normal to the first and second surfaces of the fabric.

A method for forming an electromagnetic radiation absorbing/transmitting composite material suitable for application to a composited structure, the method comprising the step of:

• a) providing a sheet of fabric having first and second surfaces, the fabric being formed of an insulating material;
• b) pre-impregnating magnetically permeable thread with resin, the magnetically permeable thread having a permeability greater than the permeability of free space;
• c) placing the resin pre-impregnated magnetically permeable thread into the fabric;
• d) curing the resin pre-impregnated magnetically permeable thread, so as to substantially affix the thread to the fabric;
• e) removing portions of the thread proximate the first and second surfaces of the fabric so as to define magnetically permeable elements disposed generally normal to the first and second surfaces of the fabric.

A method for forming a synthetic magneto-dielectric composite material for absorbing/transmitting electromagnetic radiation, the method comprising the steps of:

• a) providing a sheet of fabric formed of an insulating material, the sheet having first and second surfaces;
• b) placing magnetically permeable thread into the fabric such that it extends repeatedly from proximate the first surface to proximate the second surface thereof, the magnetically permeable thread comprising a material having a permeability greater than the permeability of free space;
• c) impregnating the fabric with resin;
• d) curing the resin impregnated fabric;
• and
• e) abrading the first and second surfaces of the fabric after curing so as to remove portions of the thread proximate the first and second surfaces of the fabric to form a plurality of permeable elements within the fabric;
• f) wherein the magnetically permeable thread is configured to provide predetermined off-normal TE and TM response within a selected frequency range, so as to provide desired absorption/transmission of electromagnetic radiation.