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The design of a rectangular microstrip applicator combined with periodic structures in order to obtain bandwidth enhancement is presented. The simulated results show that a significant improvement in bandwidth is achieved. The applicator has bandwidth of 2.5 % and 6 % respectively without and with periodic structures.
Since the demand for autonomous wireless sensors increases, there is an important interest in battery-less systems that use radiofrequency (RF) energy harvesters. The key element on the receiving side of an energy harvesting system is the rectenna (rectifier + antenna) which receives electromagnetic power and converts it into electric continuous power. With the development of multiple frequency bands...
In this paper, a square-shaped microstrip passive RFID tag suitable for wall mount in RFID localization systems is presented. The tag antenna is designed for the ultra-high frequency (UHF) band and is excited by a dual inset feed network to achieve circular polarization (CP). A cross slot is embedded in the square patch to reduce antenna size and extend CP bandwidth. Characterization in an anechoic...
In this paper a new silicon-based antenna structure with an embedded back cavity is presented. The basic antenna with an optimized geometry has good impedance matching with return loss of −40 dB at the resonant frequency of 60 GHz and a gain of 7.6 dBi. A multi-layer structure can be realized that can lead toward the design of electromagnetic bandgap (EBG) layers inside the antenna to obtain desirable...
In this paper, a double dielectric superstrate layer DSL above a microstrip patch antenna in 60 GHz; based on the recent developed standards requirements; is studied and designed. The effects of microstrip antenna with a double superstrate layer on its gain, directivity and resonant characteristics is presented. We simulated the gain of antennas within and without a double superstrate layer. The maximum...
The relationship among the radar cross-section (RCS), the antenna gain and the activation range of passive UHF radio frequency identification (RFID) transponders was determined in this paper. The originality of our paper is that we have proposed to determine the antenna gain and the reading range of an inlay tag by a non-destructive way and with conventional radio frequency measuring devices. We first...
This proposed methodology is an interesting tool which allows to compare several multi-antennas systems designed for a given application. This comparison is made possible thanks to the introduction of the referenced diversity gain. This methodology has the advantage to take into account a group of pondered situations which describes a real application. It is now possible for manufacturers to choose...
In order to generate a first-time right design, system level modeling and simulation is a major step. Thus, optimization of integrated wireless systems requires the development of behavioral models of the RF link (antenna-medium-antenna) compatible with the microelectronic design tools. Firstly, this paper shows the need of such models within the Top-Down design flow of an UHF RFID system. Then, a...
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