Handbook of smart antennas for RFID systems

The Handbook of Smart Antennas for RFID Systems is a single comprehensive reference on the smart antenna technologies applied to RFID. This book will provide a timely reference book for researchers and students in the areas of both smart antennas and RFID technologies. It is the first book to combine two of the most important wireless technologies together in one book. The handbook will feature chapters by leading experts in both academia and industry offering an in-depth description of terminologies and concepts related to smart antennas in various RFID systems applications

Handbook of smart antennas for RFID systems / edited by Nemai Chandra Karmakar.

Includes bibliographical references and index.Book fair 2013.xxiii, 620 p. :The Handbook of Smart Antennas for RFID Systems is a single comprehensive reference on the smart antenna technologies applied to RFID. This book will provide a timely reference book for researchers and students in the areas of both smart antennas and RFID technologies. It is the first book to combine two of the most important wireless technologies together in one book. The handbook will feature chapters by leading experts in both academia and industry offering an in-depth description of terminologies and concepts related to smart antennas in various RFID systems applications. Some topics are: adaptive beamforming for RFID smart antennas, multiuser interference suppression in RFID tag reading, phased array antennas for RFID applications, smart antennas in wireless systems and market analysis and case studies of RFID smart antennas. This handbook will cover the latest achievements in the designs and applications for smart antennas for RFID as well as the basic concepts, terms, protocols, systems architectures and case studies in smart antennas for RFID readers and tags

ELECTROMAGNETICALLY COUPLED MICROSTRIP PATCH ANTENNAS • THEORETICAL AND EXPERIMENTAL INVESTIGATIONS

In recent years microstrip patch radiators have been. playing an increasing role in antenna design. The light weight, low profile and conformability of microstrip antennas make them very attractive for aircraft, missile and satellite applications. One of the promising method of feeding energy to the radiating element that was suggested recently is to couple the feedline electromagnetically to the patch radiator. This novel feed mechanism has the advantages of effective coupling, ease of fabrication, reduced spurious radiation from the feed network and large bandwidth. This method provides for flexibility in choosing the substrates which best meet the conflicting requirement of dissimilar substrates for feed network and patch radiator. In this thesis, an improved model is proposed for accurate evaluation of an electromagnetically coupled (EMC) rectangular patch antenna. In the proposed model, the antenna is viewed as a planar waveguide which is excited by a magnetic surface current. The equivalent circuit for the feed line and waveguide transition is developed. Effects of the stored energy and radiated energy are incorporated in the equivalent circuit. Numerical results for the input impedance and the return loss of the EMC patch antenna are obtained from the proposed model and from the two other existing models. The results were compared with the measured data (experiments were conducted in the Electrical Engineering laboratory). The proposed model is found to have a better agreement than the existing models with respect to the return loss and the input impedance of an EMC microstrip antenna

Multiresonator-Based Chipless RFID: Barcode of the Future

This vital new resource offers engineers and researchers a window on important new technology that will supersede the barcode and is destined to change the face of logistics and product data handling. In the last two decades, radio-frequency identification has grown fast, with accelerated take-up of RFID into the mainstream through its adoption by key users such as Wal-Mart, K-Mart and the US Department of Defense. RFID has many potential applications due to its flexibility, capability to operate out of line of sight, and its high data-carrying capacity. Yet despite optimistic projections of a market worth $25 billion by 2018, potential users are concerned about costs and investment returns. Clearly demonstrating the need for a fully printable chipless RFID tag as well as a powerful and efficient reader to assimilate the tag’s data, this book moves on to describe both. Introducing the general concepts in the field including technical data, it then describes how a chipless RFID tag can be made using a planar disc-loaded monopole antenna and an asymmetrical coupled spiral multi-resonator. The tag encodes data via the “spectral signature” technique and is now in its third-generation version with an ultra-wide band (UWB) reader operating at between 5 and 10.7GHz

Time and Frequency Domains Analysis of Chipless RFID Back-Scattered Tag Reflection

Chipless radio frequency identification (RFID) is a wireless technology that has the potential for many industrial applications, including the internet of things (IoT) applications, in which identification, sensing, and tracking are required. This technology has been improved during the last century. However, the processing of the backscattered signal in a chipless RFID system is still a challenge because the encoded data are embedded in the backscattered signal of a passive tag. The reader hardware, antennas, and the wireless channel have their own response in the received signal, which contains the tag ID information. The tag also produces a response, which is a combination of responses from different resonators, substrate, and copper reflection in a tag. In this paper, the reflection from a typical chipless RFID tag is analyzed, and all components of the backscattered signal are separated in both time and frequency domains. In addition, an equivalent circuit model for a backscattered chipless RFID tag is proposed, and the model is verified based on the actual performance of the resonator. This study has some important implications for future research