| Method | Re (S11) | Im (S11) | |S11| | Er |
| Present method | 0.0768 | −0.2662 | 0.2771 |
|
| Serizawa, Hongo [19] | 0.0713 | −0.2344 | 0.2450 | 13% |
| Bird [10] | 0.0706 | −0.2352 | 0.2456 | 12% |
| Macphie [14] | 0.0632 | −0.2403 | 0.2484 | 11% |
| Baudrand [16] | 0.0655 | −0.2709 | 0.2787 | 0.5% |
| Mongiardo [20] | 0.0803 | −0.2365 | 0.2498 | 10% |