%0 Journal Article
%T Project and Realization of a Wide-Range High-Frequency RFID Gate Allowing Omnidirectional Detection of Transponders
%A Giuliano Benelli
%A Stefano Parrino
%A Alessandro Pozzebon
%J ISRN Communications and Networking
%D 2012
%R 10.5402/2012/430684
%X We describe the study and development of a 2-meter-wide HF RFID gate providing omnidirectional detection of transponders. Common commercial HF RFID gate structures provide a maximum reading range around 150£¿cm. Moreover, this value is in most cases guaranteed only for the maximum coupling direction, with lower values for the other 2 orientations. The proposed structure raises the value of the reading range up to 200£¿cm for every orientation of the transponder, with even better results (220£¿cm) when the transponder is in the position of maximum coupling. This result has been achieved through numerical simulations, focused on the study of the geometry of the antenna system and on the realization of the matching circuit and then confirmed with the physical implementation of the system. 1. Introduction With the term RFID (Radio Frequency Identification) are indicated all the technologies that allow the contactless identification (i.e., the unambiguous recognition) of an item, an animal, or a person using the electromagnetic fields as the mean of communication [1, 2]. Obviously the term RFID encompasses several different technological devices, with different operating frequencies and different electronic features. Due to this fact, every time that RFID is chosen as the right technology to be used for a particular application, specific studies have to be done in order to identify the adequate technical solution offering the best ratio among costs and performances. In addition, the use of electromagnetic fields in particular environments such as hospitals or any other public building can have several limitations due to the presence of people and the interaction with other electronic devices. While the historical applicative fields of RFID have always been the access control, the industrial tracking, and the surveillance systems, in the last years new scenarios are emerging: one of the most significant is, for example, the field of the Healthcare. The integration of automatic identification techniques with the technological frameworks of hospitals, emergency rooms, or nursing homes can increase the efficiency of all the assistance operations improving the mobility and the accessibility to the informative systems. The paper is organized as follows. In Section 2, the basic concepts concerning the antennas for HF RFID systems are described, focusing on the materials to be used, on the factors influencing the final performances, and on the matching of the antenna. Section 3 describes the possible configuration of antenna gate structures. In Section 4, the
%U http://www.hindawi.com/journals/isrn.communications.networking/2012/430684/