Table 1 Broadband perfect absorption, number of resonators.
Broadband soft wall | Broadband impedance match | |
|---|---|---|
1 Resonator, Small section duct | 1 Resonator: No Unreachable optimal impedance | F Resonators: Yes Each resonator is responsible for one frequency |
F Resonators In parallel | 1 Resonator: No Unreachable optimal impedance | F Resonators: Yes Each resonator is responsible for one frequency |
F Resonators In cascade | 1 Resonator: Yes \(\delta \) is different for every pair of resonators | F Resonators: Yes Each resonator is responsible for one frequency |
