Table 2 S-Parameter comparison of the four antenna arrays.
S-parameters | |S11|< − 10 dB (GHz) | Ave. impedance matching (dB) | Ave. S12 (dB) | Ave. S13 (dB) | Ave. S14 (dB) | Fractional BW (%) |
|---|---|---|---|---|---|---|
Reference antenna array | 3.5 – 5.0 | 12 | 13 | 17 | 15 | 35.29 |
Array with T-stub | 3.1—4.85 | 20 | 16 | 19 | 18 | 44.02 |
Array with T-stub and dot-wall | 3.0—5.0 | 21 | 23 | 27 | 23 | 50 |
Optimized Array with DGS (measured) | 3.0—5.5 | 20 | 27 | 33 | 28 | 58.82 |
Improvement of optimized array c.f. reference array | 1 | 8 | 14 | 16 | 13 | 23.53 |
