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Martinez F.J.,University of Zaragoza | Toh C.K.,Alico Systems Inc | Toh C.K.,National Cheng Kung University | Cano J.-C.,Polytechnic University of Valencia | And 2 more authors.
Wireless Personal Communications | Year: 2012

In this paper, we present a statistical analysis based on the 2k factorial methodology to determine the representative factors affecting traffic safety applications in Vehicular ad hoc networks (VANETs). Our purpose is to determine what are the key factors affecting Warning Message Dissemination (WMD) in order to concentrate on such parameters, thus reducing the amount of required simulation time when evaluating VANETs. Simulation results show that the key factors affecting warning messages delivery are: (i) the transmission range, (ii) the radio propagation model used, and (iii) the density of vehicles. Based on this statistical analysis, we evaluate a compound key factor: neighbor density. This factor combines the above-mentioned factors into a single entity, reducing the number of factors that must be taken into account for VANET researchers to evaluate the benefits of their proposals. © 2011 Springer Science+Business Media, LLC.


Sabah C.,Middle East Technical University | Urbani F.,Alico Systems Inc | Uckun S.,University of Gaziantep
Journal of Electrical Engineering | Year: 2012

In this study, the dispersion relation and the frequency dependence of Bloch impedance in a left handed transmission line (LH-TL) is carried out using the F-matrix formulation and Bloch-Floquet theorem. The artificial LH-TL formed by periodic lumped elements is described and the F-matrix, dispersion relation and the Bloch impedance are formulated according to this description. Numerical results for lossless and lossy LH-TL are presented and discussed. © 2012 FEI STU.


Sabah C.,Middle East Technical University | Urbani F.,Alico Systems Inc
Optics Communications | Year: 2013

Numerical simulation and experimental analysis of a novel metamaterial using periodic passive planar structure composed of Λ-shaped inclusions are presented. Experimental and computational results are shown to be in very good agreement. The Λ-shaped inclusions operate as magnetic resonators providing negative permeability behavior as a result of the magnetic resonance arising from the self and mutual coupling of the inclusions. Issues related to the unit cell dimension versus operation wavelength are also addressed. The proposed design allows the metallization to be non-nested as opposed to the usual split-ring-resonators. Furthermore, specific permeability values at the frequency of interest can be easily established by changing the inclusion dimensions providing extra flexibility to control the electromagnetic response of the structure. The proposed design and its variations enable myriad applications such as super-lens for free-space microwave-focusing as well as creating double-negative metamaterials by combining the structure with a conducting strip. © 2013 Elsevier B.V.


Mirkamali A.,Ecole Polytechnique de Montréal | Mirkamali A.,Alico Systems Inc | Deban R.,Ecole Polytechnique de Montréal | Siaka F.,Ecole Polytechnique de Montréal | Laurin J.-J.,Ecole Polytechnique de Montréal
IET Microwaves, Antennas and Propagation | Year: 2016

A novel feed system for circular arrays enabling beam steering over 360° in the azimuth plane with a stable scanned beam is proposed. It consists of rotating and fixed parts. The rotating part is a two-dimensional offset fed parabolic reflector which is inside a circular parallel plate waveguide. The power coming from the rotating part is coupled with the elements of the circular array through a fixed coupling structure. The rotating part is light and its moment of inertia is significantly less than the conventional rotating antenna systems for beam scanning. Therefore, the beam can be steered much faster than the current rotating antenna systems. The details of the structure including the rotating and the fixed parts are presented and a design procedure for the fixed coupling section is suggested. The performance of the feed system is investigated by simulations and measurements. It is shown that the simulations and experimental results are in good agreement. © The Institution of Engineering and Technology.


Fulton C.J.,University of Oklahoma | Mirkamali A.,Alico Systems Inc
IEEE Antennas and Propagation Magazine | Year: 2015

A computer-aided technique is proposed to obtain the embedded characteristics of the elements in a cylindrical phased array using a unitcell approach in Ansys High Frequency Structure Simulator (HFSS). The proposed technique is general and can be used with other commercially available electromagnetic (EM) products that support periodic boundary conditions. Therefore, it can be widely adopted by engineers and researchers to analyze arbitrary element structures in cylindrical phased arrays. The implementation of the technique is discussed in detail, and the related formulation is presented. The method is verified by comparing its results with published literature as well as results obtained through full-wave analysis of a ring of microstrip patch antennas in HFSS. © 1990-2011 IEEE.


Cano J.,Polytechnic University of Valencia | Cano J.-C.,Polytechnic University of Valencia | Toh C.K.,Alico Systems Inc | Calafate C.T.,Polytechnic University of Valencia | Manzoni P.,Polytechnic University of Valencia
IEEE Communications Magazine | Year: 2010

Mobile ad hoc networks are highly dynamic networks that offer multihop communications in the presence of changing topologies without the need for any fixed infrastructure support. These networks can be useful in a wide variety of scenarios, but setting them up and deploying services on them is a difficult task, even for experienced users. In this article we present EasyMANET 's an extensible platform the main objective of which is to encourage the widespread adoption and use of MANETs by non-expert users. To achieve this objective, EasyMANET provides two essential elements: an address autoconfiguration system and a name resolution service known as Visual DNS. The autoconfiguration system allows users to join an 802.11-based MANET by establishing the parameters of their terminal interfaces quickly and transparently. Thereafter, Visual DNS offers a graphical view of MANET participants and gives users the possibility to access the services made available by other users. Examples are communication services (text-based chat, VoIP, videoconference), file sharing, and localization services. We performed several laboratory experiments, and evaluated the performance of EasyMANET based on address autoconfiguration time and Visual DNS performance. Results show that EasyMANET can be established within seconds, and EasyMANET applications are easy to use. In fact, over 360 students have tried using Easy- MANET without problems. © 2006 IEEE.


Alico Systems Inc | Entity website

Alico Systems is an innovative product development company. Our development solutions address the Consumer, Industrial, Government and Military market segments with products such as Mobile Wireless Computing Platforms for Image Processing, Voice, Video and Data Communications; phased array beam steered antennas, RF Transceivers, Microprocessor and FPGA electronics; and Wireless Sensor Networks for Remote Monitoring and Control ...


Alico Systems Inc | Entity website

Alico Systems Inc announces the launching of our new division Alico Technologies to market, distribute, install and deliver turn key IT products. We are partnering with Wavetec to market their Queue Management Systems, Digital Signage, and Workflow Management Products in the United States! Wavetec FZCO is a multinational technology company headquartered in Dubai, UAE with locations in 70 countries around the world ...


Alico Systems Inc | Entity website

Technology Market Segments We are a technology product development company. We take ideas, concepts, requirements, or specifications to produce marketable technology products ...


Grant
Agency: Department of Defense | Branch: Special Operations Command | Program: SBIR | Phase: Phase I | Award Amount: 149.88K | Year: 2012

This proposal for a Ka-band Spread Spectrum terminal presents a unique affordable design approach for On-the-move satellite communications. Over the past 5 years Alico Systems has been involved in the design and development of low cost phased array antennas for the DoD. Our most recent product for the Army is based on a 2 dimensional affordable X-band broadband phased array design. For this Ka-band terminal we are proposing a one dimensional phased array antenna mounted on a turntable coupled to the iDirect e850mp spread spectrum modem to provide 5 Mbps uplink and 5 Mbps downlink capability. The proposed terminal will meet MIL-STD-810G Environmental, MIL-STD-461F EMI, and MIL-STD-1275D Vehicle Power requirements.

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