ABSTRACT
The microwave-absorbing coatings on the surfaces of materials could prevent them from being detected by radar. Microwave-absorption efficiency of materials varies according to the magnetic and dielectric properties of the fillers and matrix. A material used as a microwave absorber must either absorb or dissipate electromagnetic energy. When strongly conductive materials such as metals are exposed to microwaves, these microwaves can be reflected from materials. The microwave absorption properties are determined by the transmission line theory, short-circuited reflection and open-circuited reflection. The microwave absorbers are manufactured with their electromagnetic and dielectric properties. The microwave-absorbing materials can be classified into radar-absorbing coating material and structural radar-absorbing material. The microwave heating and absorption performance within homogeneous and heterogeneous composites is described by complex permittivity and complex permeability. The dielectric and magnetic properties of fillers and matrix are important to determine the microwave performance of radar absorbing materials.
