Desenvolvimento de antenas UHF planares flexíveis por subtração química

Abstract

Passive planar radio frequency identification tags, RFID in Ultra-High Frequency - UHF has been an increased demand in recent years, thanks to its flexibility regarding applications that can be implemented in all kinds of products and materials. It can be used for purposes such as inventory control, ensuring product integrity with tamper-evident seals, theft prevention, fleet vehicle management, access control to restricted areas, and more. The need for developing new models that efficiently serve these diverse fields of application is timely. Creating more antennas using new technologies to increase the gain and reducing the size of the antenna without sacrificing efficiency, as the efficiency of an RFID antenna directly depends on its size, reflective, conductive, dielectric properties, and the material to which it is applied. For example, tags designed for more capacitive or insulating materials like glass or rubber usually have lower performance compared to tags of the same dimensions designed for materials that have less interference with their electromagnetic properties, such as cardboard or even flag-type tags that are not directly applied to the material but are fixed using an adhesive like a flag. The expected performance of RFID tags should be considered early in the design process. This work aims to demonstrate the prototyping procedure of an RFID antenna, covering the main requirements of planar antennas.