Table 1.
Summary of the important results of existing works on the broad bandwidth absorbers of multilayer FSS structures.
| References | 10 dB bandwidth frequency range (GHz) | Fractional bandwidth (%) | Absorber thickness (mm) | Number of FSS |
|---|---|---|---|---|
| 22 | 8.4–21.0 | 86 | 3.7 (0.10λL) | 3 |
| 23 | 6.0–19.0 | 104 | 4.4 (0.08λL) | 4 |
| 22 | 10.0–70.0 | 150 | 4.5 (0.15λL) | 4 |
| 25 | 5.0–18.0 | 114 | 4.6 (0.08λL) | 2 |
| 26 | 7.0–37.4 | 137 | 3.8 (0.09λL) | 3 |
| This work | 6.3–40.0 | 145 | 5.5 (0.11λL) | 2 |
The fractional bandwidth is given by the ratio of bandwidth to center frequency. λL is the wavelength at the lowest operating frequency.