Resonance Radar Absorber Matched with Free Space at a Given Frequency

—A resonance radar absorber is proposed that is theoretically matched with the free space for a reflection coefficient level no greater than –40 dB at a given frequency. The design of the absorber is an array of electrically conductive squares on a lossy dielectric layer metallized on the opposite side of the array. A preset dielectric is used in the absorber design, and the dimensions of the square elements of the array are many times greater than the thickness of the dielectric layer. The relative change in the resonance frequency with a change in the angle of incidence of TE- and TM-polarized waves in range of 0°–45° does not exceed 1%.