Design and study of a near omnidirectional transparent electromagnetic absorber

In this paper, the characteristic mode (CM) theory is applied to explain the causes of omnidirectional radiation, of which is then introduced to design an optically transparent electromagnetic absorber. Based on the omni-directional radiation theory, a “mushroom-type” structure with omnidirectional radiation in the LS- and S- frequency band is designed, and then all metallic materials on the structure are replaced with transparent resistive materials to investigate the effect of materials with different sizes of square resistance on the omnidirectional absorption performance.