ISEL - Eng. Elect. Tel. Comp. - Artigos
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Browsing ISEL - Eng. Elect. Tel. Comp. - Artigos by Author "Abreu, Ricardo"
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- Microstrip antenna array for multiband dedicated short range communications systemsPublication . Varum, Tiago; Matos, João; Pinho, Pedro; Abreu, Ricardo; Oliveira, Arnaldo; Lopes, JorgeDedicated Short Range Communications (DSRC) is the key enabling technology for the present and future vehicular communication for various applications, such as safety improvement and traffic jam mitigation. This paper describes the development of a microstrip antenna array for the roadside equipment of a DSRC system, whose characteristics are according with the vehicular communications standards. The proposed antenna, with circular polarization, has a wide bandwidth, enough to cover the current European DSRC 5.8 GHz band and the future 5.9 GHz band for next generation DSRC communications. (C) 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 53: 2794-2796, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26394
- Nonuniform broadband circularly polarized antenna array for vehicular communicationsPublication . Varum, Tiago; Matos, João N.; Pinho, Pedro; Abreu, RicardoRoad safety applications drive the development of vehicular communications as support to intelligent transport systems. The communications network necessary for this is supported by dedicated short-range communications (DSRC), which is based on roadside units (RSUs) and onbo ard units. In the RSU, the DSRC physical-layer standards, along with practical issues, require specific radiation patterns of the respective antenna, leading to the use of unusual arrays of antennas. This paper describes a new concept based on a binomial array structure, which simplifies the design of the antenna array while ensuring good performance. The new structure developed for this antenna enabled the design of a feed network using unbalanced power dividers in the same plane as that of the radiating elements, maintaining the favorable characteristics of microstrip antennas.