An UHF RFID reader antenna made of recycled and reutilized materials from construction debris

Abstract

A circularly polarized microstrip metallic patch antenna made reusing and recycling materials from construction debris is proposed, designed, fabricated and validated in this paper. Such device is used in RFID systems operating at the 902-928MHz UHF band allocated for International Telecommunication Union, ITU, Region 2, that includes North and South America. The antenna is composed of two stacked patches, a T junction based on microstrip lines and a ground plane, being those arranged in simple and low cost structure. Experimental and simulation results of this microwave device are presented and discussed.

A Novel Gain-Enhanced Antenna With Metamaterial Planar Lens for Long-Range Uhf Rfid Applications

“…A tapered three-dimensional transition is a compact impedance matching structure that connects the feeding network to the square patch [9]. Thus, this general purpose MSA is based on [23] and specified as circularly polarized microstrip square patch with a ground plane, a main and a parasite patches, a microstrip feed line working as a T-junction and a three-dimensional transition impedance matching device that binds the main patch with the feeding network mentioned above. The ground plane is separated from the main patch by four cylindrical polypropylene spacers with hpi of height that provide an air substrate layer which reduces losses, such as those from surface waves, increasing thus bandwidth, efficiency, and gain, for instance [11].…”

“…The ground plane is separated from the main patch by four cylindrical polypropylene spacers with hpi of height that provide an air substrate layer which reduces losses, such as those from surface waves, increasing thus bandwidth, efficiency, and gain, for instance [11]. The use of this air substrate layer is the most significant structural advance of this general-purpose MSA in comparison with [23]. The parasite square patch is on top of the main, being also separated by four cylindrical polypropylene spacers with hpa of height and another air substrate layer.…”

Estudo de viabilidade na utilização de RFID para identificação de ovinos e caprinos

“…O Alien ALR-9900 utiliza ainda uma topologia de antena monoestática que faz a emissão e a recepção de dados proveniente da antena para etiquetas, segundo [5]. As quatro antenas usadas foram fabricadas no IFCEcampus Tauá como parte do programa PIBITI, de acordo com [16].…”

“…Ambas tags eram do tipo passiva, adesivas e usavam antenas dipolo. As duas possuíam o mesmo padrão EPC Classe 1, Geração 2, onde trabalhavam com a frequência UHF, como visto em [16].…”