Review Article
Transponder Designs for Harmonic Radar Applications
Table 1
Summary on the features of some harmonic radar tags found in the literature.
| Reference | & 2 (GHz) | Transponder dimensions | Mixing element | Type of matching |
| [11] | 1 & 2 | mm2 () | Schottky | Direct | [19] | 9.41 & 18.82 | 16 mm, 1 mm | Schottky | Direct | [20] | 0.917 & 1.834 | 50 mm, 0.152 mm | Schottky | Direct | [29] | 1.59 & 3.18 | cm2 () | Nonspecified diode | Stepped-impedance microstrip lines | [30] | 2.45 & 5.9 | 15.7 cm, 1.5 cm | Schottky | Direct | [31] | 5.9–6 & 11.8–12 | mm2 () | Schottky | Direct | [33] | 38.5 & 77 | mm2 () | Schottky | Direct | [41] | 0.914 & 1.828 | mm2 () | Schottky | Direct | [42] | 2.4 & 4.8 | 30 mm (diagonal) | Schottky | Impedance transformer based on microstrip lines | [45] | 1.3 & 2.6 | mm2 () | Schottky | Direct and external matching |
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