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In this article, the authors propose the use of conducting patches with slots to design frequency selective surfaces (FSS) with dual bandstop for wireless LAN (WLAN) applications. The simulated results were obtained with the computer program Ansoft Designer TM . A prototype of the designed FSS was built and its transmission characteristics were measured. Excellent agreement between simulated and measured results was obtained. The FSS was useful for rejecting signals from industrial, scientific, and medical and unlicensed national information infrastructure bands and it presented angular stability. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:265-268, 2015; View this article online at wileyonlinelibrary.com.ABSTRACT: In this article, a novel coplanar waveguide (CPW)-fed triple-band antenna for WLAN/WiMAX is proposed. The proposed antenna is simply composed of three arc-shaped strips and is capable of generating three separate resonant modes with good impedance matching conditions. The effects of varying the dimension on the proposed antenna performance were also studied. Prototypes of the proposed antenna were constructed and experimentally studied. The experiment results show that the proposed antenna covers 1.66-2.71, 2.95-4.54, and 5.02-6.10 GHz with 210 dB return loss, covering all the 2.4/5.5/5.8 WLAN bands and 2.5/3.5/5.5 GHz bands. Furthermore, this CPW-fed monopole antenna exhibits a nearly omnidirectional radiation pattern in the H-plane and a dipole-like radiation pattern in the E-plane. Also, good antenna gains for operating bands were obtained. V C 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:268-273, 2015; View this article online at wileyonlinelibrary.com.

In this article, the authors propose the use of Cantor dust fractal geometry design frequency selective surfaces (FSS) with wideband, angular, and polarization independent operation aiming ultrawide band (UWB) applications. The simulated results were obtained with the computer program Ansoft Designer™. A prototype of the designed FSS was built and its transmission characteristics were measured for vertical and horizontal polarization. A good agreement between simulated and measured results was obtained. The FSS was stable angularly and in terms of polarization and proved to be useful for UWB applications. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:216–219, 2015

This article presents simulation and experimental investigation of a frequency‐selective surface (FSS) using simple fractal geometry. The geometry used in design of multiband FSS was the fractal spiral element (FSE). Simulated results obtained to fractals FSS were compared with measured results. Three structures were designed with FSE Levels 4, 5, and 6. These entire structures act like stop‐band filters with multiband response. Both simulation and experimental investigations were done. Simulation investigation was performed using the Ansoft Designer™ software. Experimental investigation was performed using an Agilent Technologies vector network analyzer—model N5230A. A good agreement between the results was obtained. © 2012 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54: 2321–2325, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.27045

Um jogo sério para auxiliar pessoas com síndrome de down no desenvolvimento da motricidade fina das mãos A serious game to help people with down syndrome in the development of fine hand motricity