Optimization of multichip RFID tag antenna with genetic algorithm and method of moments

A specific procedure is implemented for the optimization of passive part of multichip RFID tag antenna, based on the performance parameter in terms of newly developed concepts. Examples are given and significant improvements have been observed comparing with previous results, which verifies the approach

Advances in Vehicular Ad-hoc Networks (VANETs): challenges and road-map for future development

Recent advances in wireless communication technologies and auto-mobile industry have triggered a significant research interest in the field of vehicular ad-hoc networks (VANETs) over the past few years. A vehicular network consists of vehicle-to-vehicle (V2V) and vehicle-to-infrastructure (V2I) communications supported by wireless access technologies such as IEEE 802.11p. This innovation in wireless communication has been envisaged to improve road safety and motor traffic efficiency in near future through the development of intelligent transportation system (ITS). Hence, governments, auto-mobile industries and academia are heavily partnering through several ongoing research projects to establish standards for VANETs. The typical set of VANET application areas, such as vehicle collision warning and traffic information dissemination have made VANET an interesting field of mobile wireless communication. This paper provides an overview on current research state, challenges, potentials of VANETs as well as the ways forward to achieving the long awaited ITS

Compact planar L-band antenna arrays with optimal diversity performance

At L-band (1-2GHz) due to significantly large freespace wavelengths, compact antenna arrays with small interelement separation i.e., d < λ/2, are a suitable choice for overall size reduction. However, mutual coupling becoming prominent in compact arrays results in a degradation of the diversity degreesof- freedom, which are required for beamforming capabilities in modern receivers. In this paper we discuss a potential approach to mitigate this limitation. We present empirical results for an eigenmode analysis applied to the radiation matrices of compact planar arrays, derived from the far-field integration of complex realised-gain matrices. Furthermore, optimal arrangements for compact planar arrays with respect to the highest possible value of minimum eigenmode efficiency are discussed. It could be shown that planar arrays have higher efficiencies and lower radiation correlation, hence better diversity degrees-of-freedom than linear arrays, particularly in a compact configuratio

IEEE Antennas & Propagation Magazine : Vol. 55, No. 6, December 2013

1. Passive UHF RFID antennas for sensing applications: principles, methods, and classifications. 2. A Digitally beam-steerable antenna aray system for positioning-based tracking application. 3. Multi-objective self organizing migrating algorithm applied to the design of electromagnetic components. 4. An efficient iterative MoM-PO hybird method for analysis of an onboard wire antenna aray on a large-scale platform above an infinte ground. 5. A Unified solution of laplace\u27s equation in an arbitrary region. 6. A Wideband circularly polarized stacked slotted microstrip patch antenna. 7. Analysis of shorted-plate compact and broadband microstrip antenna

Miniaturized Dielectric Resonator Antenna Array for GNSS Applications

The increase in global navigation satellite systems (GNSS) availability and services is fostering a new wave of applications related to satellite navigation. Such increase is also followed by more and more threats, aiming at signal disruption. In order to fully exploit the potentialities of precise and reliable navigation, being able at the same time to counteract threats such as interference, jamming, and spoofing, smart antenna systems are being investigated worldwide, with the requirements of multiband operation and compactness. In order to answer such need, the present work proposes a miniaturized dielectric resonator antenna (DRA) 2 × 2 array able to operate at E5/L5, L2, and E6 bands, with an overall footprint of only 3.5′′ (89 mm)

Multi-Chip RFID antenna integrating shape-memory alloys for detection of thermal thresholds

Low-cost wireless measurement of objects’ tempera- ture is one of the greatest expectation of radiofrequency identi- fication technology for the so many applications in cold supply- chain control and safety assessment in general. In this context, the paper proposes a dual-chip UHF tag embedding shape memory al- loys (SMA) able to transform the variation of the tagged item’s temperature into a permanent change of antenna radiation fea- tures. This event-driven antenna is hence able to selectively activate the embedded microchips according to the temperature above or below a given threshold. A general design methodology for the re- sulting two-ports tag antenna is here introduced and then applied to prototypes able to work at low (around 0°C ) and high (80°C ) temperatures