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Design and experimental investigations are presented for a dual‐band frequency selective surface (FSS) with perfectly conducting rectangular patch elements. The work was developed in two steps. In the first step, two single‐band FSS screens were designed to obtain resonant frequencies at 9.5 GHz and 10.5 GHz, each one with about 1.5 GHz bandwidth. In the second step, these single FSS screens were cascaded and separated by an air gap layer to achieve a dual‐band response. The proposed dual‐band FSS screen is easy to analyze and to fabricate with low cost materials and exhibits a low weight and easy to handle structure. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 942–944, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24236

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Abstract-In this paper, a software for design and analysis of frequency selective surfaces (FSS) based on the equivalent circuit model is presented, with emphasis on teaching students in the interaction between FSS parameters. Tools to design FSSs and a tutorial with theoretical elements of the equivalent circuit method, applied to FSS, compose this software. The software can be used at FSS analysis and design course to consolidate the first theoretical and illustrated concepts.Index Terms -Frequency selective surfaces, equivalent circuit method, interactive computing, simulation software.I. INTRODUCTION Since the invention of the electronic computer there are two divergent opinions to show how this device should be used. One group saw the computer's principal use as a number manipulator: an extensive, ultrafast, and accurate calculator. A second group envisioned the computer as a symbol manipulator that might be taught to use logic and make decisions in a human fashion [1].Frequency selective surfaces (FSS) are periodic structures in two dimensions that can provide frequency filtering to incoming electromagnetic waves. Traditional FSS structures have been investigated over the years for a variety of applications (e.g., frequency filters or diplexers in high performance reflector antenna systems, advanced radome designs, and smart surfaces for stealth applications) [2].The analysis and design of FSS, and the calculation of their parameters, is inherently multidisciplinary, demanding knowledge of antenna, electromagnetic theory and FSS analysis and design disciplines. For example, when a parameter is modified in a FSS, this modification has some electromagnetic consequences, and hence also affects the frequency filtering.In recent years, a number of electromagnetic simulation commercial software have appeared on the market, such as CST Microwave Studio , and also a number of pedagogical software has been developed [3][4][5][6][7][8][9]. The main goal of such software is to avoid the tedious computation of the equations governing FSS theory.In this paper, pedagogical software that emphasizes the understanding of the FSS parameters, using equivalent circuit model, is presented. The outline of the paper is as follows: in Section II, a brief Av. Sen. Salgado Filho, 3000, Brazil, antonio.luiz@pq.cnpq.br and adaildo@ct.ufrn.br Robson H. C. Maniçoba and Lincoln M. AraújoFederal University of Rio Grande do Norte, Department of Electrical Engineering, Av. Sen. Salgado Filho, 3000, Natal -RN, Brazil, 59072-970, robsonhcm@gmail.com and machado.lincoln@gmail.com Journal of Microwaves, Optoelectronics and Electromagnetic Applications, Vol. 11, No.1, June 2012 Brazilian II. FSS FUNDAMENTALSA periodic array consisting of conducting patch or aperture elements is known as a frequency selective surface (FSS), or dichroic. FSS may have low-pass or high-pass spectral behavior, depending on the array element type (i.e., patch or aperture), similarly to the frequency filters in traditional radio-frequency (RF) [10]. A Tw...