Spatially confined UHF RFID detection with a metamaterial grid

• Autor(a) principal: Morgado, Tiago A.
• Data de Publicação: 2014
• Outros Autores: Alves, Jorge M., Marcos, João S., Maslovski, Stanislav I., Costa, Jorge R., Fernandes, Carlos A., Silveirinha, Mário G.
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10071/6351
• topic: Metamaterials; Near-field UHF RFID; Radio frequency identification (RFID); Wire media

The confinement of the detection region is one of the most challenging issues in Ultra-High Frequency (UHF) Radio Frequency Identification (RFID) systems. Here, we propose a new paradigm to confine the interrogation zone of standard UHF RFID systems. Our approach relies on the use of an all-planar metamaterial wire grid to block the radiation field (i.e., the far-field) of the reader antenna, and thereby obtain a spatially well-confined detection region in the near-field. This solution is analytically and numerically investigated, and then experimentally verified through near-field and tag-reading measurements, demonstrating its effectiveness and robustness under external perturbations.