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A compact RFID tag antenna suitable for metallic object applications is proposed. The antenna structure is based on a quarter-wavelength patch with one end open and the other short-circuited. Narrowing the vertical shorting wall can adjust the input impedance of the antenna while exciting the same resonant mode. The patch length can be further reduced by applying a pair of vertical thin strips or...
In recent years, Internet of Things (IoT) has become the hottest issues of Future Internet. It is the most important concept of Future Internet for providing a common global IT Platform to combine seamless networks and networked things. However, there is a lack of common fabric for integrating IoT with current Internet. That results the service providers and operators have no definite specification...
Recently, the near-field RFID systems operating at either LF (125-134 kHz) or HF (13.56 MHz) bands have been widely used due to the matured technology. However, the larger size of the antennas used in the LF/HF band systems limits their commercial applications. Thus, it is straight forward to reduce antenna size by designing the system in a higher frequency band, such as the UHF (860-960 MHz) band...
The operating principle of a passive UHF RFID tag is to receive the field illuminated by the reader antenna, energize the tag IC, and then backscatter the field modulated by the data stored in the IC. To increase the detection range, the illuminating field should be effectively coupled to the IC and the difference of the backscattered field between two impedance loading states of the tag IC should...
Recently, more and more research activities have been focused on the radio frequency identification (RFID) systems due to their applications in the supply chain management and security identifications. Among them, the design of small tag antennas with high inductive impedances is one of the most challenging tasks. To have a better power transfer between the tag antenna and the chip, the input impedance...
The proliferation of mobile computing devices and wireless networks has fostered a growing interest in location sensing systems and services. In this paper we present an improvement approach of indoor location sensing using active RFID system. This is a location sensing system that uses radio frequency identification (RFID) technology for locating objects inside a building. The major advantage of...
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