On‐body semi‐electrically‐small tag antenna for ultra high frequency radio‐frequency identification platform‐tolerant applications
| Autor: | Milan Polivka, Milan Svanda |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Engineering
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| Zdroj: | IET Microwaves, Antennas & Propagation. 10:631-637 |
| ISSN: | 1751-8733 |
| DOI: | 10.1049/iet-map.2015.0398 |
| Popis: | In this study, the authors proposed the impedance-flexible on-body semi-electrically-small tag antenna for the European ultra-high frequency radio-frequency identification (UHF RFID) frequency band. The radiator is based on differentially-fed coupled shorted-patches and vertical folding techniques, using a loop excitation. The proposed excitation methods enable the input impedance to be tuned to the complex impedance of typical UHF RFID chips as well as to 50 Ω impedance. In addition, the virtual electric short applied inside the structure simplifies the topology and manufacture. The antenna dimensions are 40 × 50 × 3 mm3 (0.12 × 0.14 × 0.01 λ 0) and represent the electrical size ka = 0.58 at 866 MHz. The total efficiency measured in open space exceeds 60%. In case that the antenna is situated on a human phantom, it accounts for 50%. Accordingly, the antenna provides the read range of 5.6 m (in open space) and 5.1 m (when located on human chest). |
| Databáze: | OpenAIRE |
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