Research And Design For Antennas Of RFID Reader And Tag

In today's society, with the advancement of technology and the development of economic,the simply Internet cannot meet the needs of social development. The next generation network——The Internet of things come to our lives. As the next generation network of the Internet, the Internet of things is a further extension of the Internet. It is an object to connect to the Internet with things. However, in this process, RFID radio frequency identification technology which plays an indispensable role in the Internet of things. It acts as a link between the object and the network. They are connected. So RFID radio frequency identification technology plays a very important aspect in the Internet of things. In this paper,theoretical knowledge of the microstrip antenna has been learned, after understanding the relevant content of RFID radio frequency identification technology, I research and design some antennas of the RFID system. The design includes antenna designs of both electronic tag and reader. Through summarizing the implementations of the circularly polarized antenna,I conduct a fusion of some classical methods, and explore new ideas.The main contents of this article includes three parts: the first part, the significance of this study and a simple introduction of its development are introduced. Then some of the theories and knowledge of the two RFID antennas which will be used in the process of the design will be summarized.After analyzing and summarizing the relevant theoretical knowledge, the three reader antennas in the RFID reader antenna are designed in the second part. However, the first two antennas are the fusion of the two classical structures which made antennas circularly polarized. The third paragraph is a dual-band circularly polarized antenna, which is analyzed after repeated experiments. And a kind of antenna composed by a circularly polarized structure which is easy to implement multi-frequency is selected.In the third part the final design is an ultra-high frequency electronic tag antenna, which is designed after the study of the relevant theoretical knowledge of RFID tag antenna and a comparison of a variety of structures. The antenna uses a folded dipole structure and the inductive coupling manner is used in impedance matching. Since we have not yet found chips of electronic tags applying to the microwave band. Finally, at microwave frequencies, we design an exploratory passive tag antenna.