Review Article
Technologies for Near-Field Focused Microwave Antennas
Table 1
planar focused arrays: performance in terms of depth of focus (
) and −3 dB spot width (
).
| Ref. | (GHz) | | | | | DoF/ | Marker |
| [4] | — | | 4.5 | 0.12 | 0.84 | — | | [5] | 2.4 | | 6.4 | 0.25 | — | 11.2 | | [7] | 2.45 | | 2 | 0.1 | 0.72 | 1.44 | | [7] | 2.45 | | 2 | 0.15 | — | 1.68 | | [7] | 2.45 | | 2 | 0.2 | — | 1.88 | | [7] | 2.45 | | 3.42 | 0.07 | 0.70 | 1.97 | | [8] | 1.8 | | 5 | 0.186 | 1.8 | — | | [12] | 2.45 | | 1.8 | 0.126 | 0.66 | 1.41 | | [15] | 2.4 | | 3.2 | 0.31 | 1.12 | 3.2 | | [16] | 2.4 | | 3.2 | 0.31 | 1.78 | 3.6 | | [20] | 10 | | 4 | 0.13 | 1.1 | — | | [20] | 10 | | 4 | 0.31 | 2.2 | — | | [22] | 10 | | 3 | 0.37 | 2.3 | — | | [33] | 5.8 | | 5.44 | 0.13 | 1.57 | 5 | |
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