Sociedade Brasileira de Micro-ondas e Optoeletrônica, Campus do Instituto Mauã de Tecnologia, São Caetano do Sul (2026)

Criada originalmente como Sociedade Brasileira de Micro-ondas, a SBMO agregou, a partir de 1992, a área de optoeletrônica.

23/09/2025

Special presentation by Prof. Qiaowei Yuan, an MTT-S Distinguished Microwave Lecturer

On behalf of the organizing committee listed below, we are pleased to announce that the IEEE MTT-S Professional and Student Chapters, in collaboration with the Federal University of Pernambuco and the Federal University of Rio Grande do Norte, cordially invite you to a special presentation by Prof. Qiaowei Yuan, an MTT-S Distinguished Microwave Lecturer affiliated with both Tohoku Institute of Technology and Tohoku University, Japan.

Registration link: https://lnkd.in/dHqfEBD4

All are welcome!

Prof. Adaildo Gomes Assunção, IEEE MTT-S Northeast Brazil Chapter Chair
Prof. Marcos T. de Melo, IEEE MTT-S Northeast Brazil Vice-Chapter Chair Miss Camila da Silva Cavalcanti, IEEE MTT-S UFPE student Chapter Chair

17/09/2025

High-Definition Digital Terrestrial Television (HDDTT) replaces analogue, requiring further research on propagation links due to atmospheric variables potentially disrupting signals during uplink and downlink reception. This study examines the impact of surface meteorological parameters on the downlink Receive Signal Strength (RSS) of an HDDTT station in a tropical location-Abuja, Nigeria. The impact of k-factor, Radio Refractivity (RaR), refractivity gradient, and Radio Horizon distance (dRH) on HDDTT RSS are also investigated. The assessments were based on an experimental setup over 12-months (Jan.-Dec., 2020). The RSS link values showed strong negative correlations with temperature, pressure, and water v***r during the day, while weak negative correlations were observed with relative humidity. A very weak correlation was also observed between RSS link and RaR, which implies a significant influence of RaR on the RSS under clear weather. With average peak and lowest values of about 364.73 and 271.91 (N-units), respectively, RaR values are slightly higher during the rainy periods, with the dry component accounts for more than 69.70% of the total values. The mean monthly k-factor and dRH are 1.39 and 133.17 km, respectively. This information will assist radio engineers in enhancing HDDTT broadcast signals, ensuring high-quality service, and fostering customer service agreements.

Link avalable in:https://doi.org/10.1590/2179-10742025v24i3291364

21/08/2025

Wider bandwidth microstrip antenna employing resonant slot require substrate thickness in excess of 0.07λg, which increases the antenna volume. In this paper, a novel technique to increase the bandwidth in E-shape microstrip antenna fabricated on a thinner microwave substrate, while employing printed resonator elements is proposed. The printed resonator positioned below the patch, introduces TM20 mode nearer to the TM10 mode in E-shape antenna that increases the bandwidth. On substrate thickness of 0.037λg, optimum design achieves bandwidth of 130 MHz (13.89%), with a broadside radiation pattern and peak gain of 7.8 dBi. With the obtained antenna characteristics, proposed thinner substrate designs will find applications in GSM band.

Link avalable in: https://doi.org/10.1590/2179-10742025v24i2291826

16/07/2025

This paper presents a fully textile band-stop frequency selective surface (FSS) designed with a central frequency of 3.6 GHz and a bandwidth of 190 MHz. The structure, composed of two semicircles connected by a central line, was designed, fabricated, and experimentally validated. The prototype was created using copper ink on a pure cotton fabric substrate and tested in the laboratory for incident angles and polarizations ranging from 0° to 45°. Additionally, the structure’s performance was examined under two different curvatures. All simulated and experimental results are provided and analyzed.

Link Avalable in https://doi.org/10.1590/2179-10742025v24i2290082

07/07/2025

Small Remotely Piloted Aircrafts (RPAs) are gaining an increasingly prominent role in society. However, their growing use has raised concerns due to their potential misuse for illicit activities. Consequently, the detection and accurate classification of small RPAs have become crucial. Conventional radar systems, however, struggle to distinguish these aircraft from birds, as their Radar Cross-Sections (RCS) are very similar. To address this challenge, the Micro-Doppler (MD) effect has emerged as a valuable tool, enabling the differentiation of signals between birds and small RPAs. It also facilitates the classification of these aircraft. This study analyzed the Micro-Doppler (MD) effect generated by the motion of the rotating components of quadcopter RPAs and explored how this phenomenon can be utilized to extract information, such as rotor rotation speeds and propeller sizes, for an initial classification of these aircraft. Furthermore, the MD effect produced by birds was examined to identify characteristics that can be used to differentiate RPAs from birds. Lastly, the results of MD effect measurements using a Frequency-Modulated Continuous Wave (FMCW) radar during the RPA FIMI X8 SE flight were analyzed and discussed.

Link avalable in: https://doi.org/10.1590/2179-10742025v24i2289901

Endereço

Campus Do Instituto Mauã De Tecnologia
São Caetano Do Sul, SP
09580-900

Site

http://www.sbmo.org.br/

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Sociedade Brasileira de Micro-ondas e Optoeletrônica