Table 2.
Comparison between the performances of the proposed MM absorber and other broadband MM absorbers.
| Ref. | Num. layers | fc [GHz] | Thickness (mm) | θ = 0° | θ = 40° | θ = 60° | θ = 65° | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| BW [%] | BW [%] | BW [%] | BW [%] | ||||||||
| TE | TM | TE | TM | TE | TM | TE | TM | ||||
| 17 | 1 | 4.8 × 104 | 1.9 × 10−3 (0.03λ) | 8.33 | 4.26 | 2.02 | 4.26 | N/A | N/A | N/A | N/A |
| 18 | 1 | 10 | 1.67 (0.056 λ) |
2.06 | 2.06 | 2.11 | N/A | 1.05 | N/A | N/A | N/A |
| 19 | 1 | 10.45 | 0.8 (0.028 λ) |
4.34 | 4.34 | 4.42 | 4.45 | 3.88 | 3.88 | 1.95 | 3.39 |
| 20 | 1 | 11.4 | 1.7 (0.065 λ) |
115.7 | 115.7 | N/A | N/A | N/A | N/A | N/A | N/A |
| 21 | 1 | 13 | 3 (0.13 λ) |
72 | 72 | 22.22 | 15.4 | N/A | N/A | N/A | N/A |
| 22 | 3 | 9 | 10 (0.3λ) |
111.1 | 111.1 | 111.1 | 80 | 26.09 | 14.28 | N/A | N/A |
| 23 | 3 | 10.87 | 5.6 (0.2λ) |
75.13 | 76.92 | 52.99 | N/A | N/A | N/A | N/A | N/A |
| This Work | 1 | 11 | 3 | 51.16 | 51.16 | 41.86 | 39.21 | 37.6 | 36.36 | 26.41 | 18.18 |
*N/A: Not applicable *BW [%]: 90% absorption bandwidth [%].