Novel ultrathin penta-band metamaterial absorber

A review of metamaterial absorbers and their application in sensors and radar cross‐section reduction

“…Another penta-band absorber with reduced complexity is shown in Figure 6H designed by combining two square geometries exhibiting single-band operation and a multiresonant structure in the middle. 11 Now, Table 1 briefly indicates all the techniques used for multiband absorption using MA along with their advantages and drawbacks.…”

“…The measurement of metamaterial-based absorbers is performed inside an anechoic chamber, as shown in Figure 10. 11 The reflection coefficient of the absorber is obtained using the free space reflection method. The fabricated absorber structure is fixed on a Styrofoam box inside an anechoic chamber.…”

“…The conductive cross dipoles provide three absorption peaks, conductive cross dipoles loaded with SRR provide another peak and conductive cross dipoles rotated by $$4{5}^{\circ }$$ also provide an absorption peak, resulting in penta‐band operation. Another penta‐band absorber with reduced complexity is shown in Figure 6H designed by combining two square geometries exhibiting single‐band operation and a multiresonant structure in the middle 11 . Now, Table 1 briefly indicates all the techniques used for multiband absorption using MA along with their advantages and drawbacks.…”

“…For measurement of the metamaterial absorber, the unit cells are arranged in a finite‐size array and fabricated on a dielectric substrate using printing or etching technology. The measurement of metamaterial‐based absorbers is performed inside an anechoic chamber, as shown in Figure 10 11 …”

“…As soon as the EM wave with a certain frequency falls on the top of the metamaterial absorber, there will be an electric and magnetic excitation at that frequency which leads to its absorption. The very first metamaterial-based absorber was introduced by Landy et al, 6 since then a number of narrowband, 7,8 multiband, [9][10][11] and broadband 12,13 absorbers have been reported. However, reducing their structural complexity and enabling polarizationinsensitivity and wide-angle stability has always been a topic of investigation.…”