Research Article
A High-Density L-Shaped Backscattering Chipless Tag for RFID Bistatic Systems
Table 1
Comparison of different chipless RFID tags (bistatic measurements).
| Resonators’ type | Frequency range (GHz) | Coding spatial capacity (bits/cm2) | Coding spectral capacity (bits/GHz) | Coding density (bits/GHzcm2) | Read range (cm) |
| C-folded dipoles [21] | 2–5 | 1.25 | 5 | 0.416 | 80 | SAW [22] | 2.44 | 1 | NA | NA | NA | Delay line [23] | 3.1–10.6 | 0.17 | 1.06 | 0.023 | 80 | Slot [24] | 3.1–10.6 | 4.17 | 3.2 | 0.556 | 60 | C-shaped [25] | 2–4 | 1.14 | 10 | 0.57 | 50 | Stub-loaded [26] | 2.5–5.5 | 1 | 2.66 | 0.33 | 50 | Stepped impedance [27] | 3.1–10.6 | 7.9 | 10.53 | 1.053 | 50 | Slot-loaded [28] | 7–12 | 1.47 | 3.2 | 0.29 | 5 | Split ring resonators [29] | 2-3 | 2.37 | 16 | 2.37 | NA | U-shaped strip [30] | 2–4 | 1.09 | 10 | 0.545 | 30 | U-shaped strip [31] | 2–4 | 0.769 | 10 | 0.385 | 25 | Double inverted U [32] | 4–14 | 7.73 | 2.99 | 1.546 | NA | DP U shape [33] | 7–12 | 16.6 | 3.2 | 3.32 | 20 | Nested concentric square loops [34] | 8–14 | 19 | 3 | 3.16 | 20 | This work | 6.5–10.5 | 18.8 | 4.5 | 4.7 | 80 |
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