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Gppcom UFRN "Inspirar estudantes de engenharia a conceber e prototipar soluções para sistemas de comunicação

Recycled Ceramic Waste Dielectric Resonator Antenna for Broadband ApplicationThis work proposes the design of a cylindri...
06/05/2026

Recycled Ceramic Waste Dielectric Resonator Antenna for Broadband Application

This work proposes the design of a cylindrical dielectric resonator antenna (DRA) developed from ceramic waste from bricks and roof tiles. The chosen geometry was cylindrical, and the material was sintered at a temperature of 1050° C. The DRA was fed using an aperture-coupled feeding method. Simulations were performed to obtain the return loss, realized gain, total efficiency, and front-to-back ratio (FBR) of the DRAs with and without slot tilt. The proposed antenna is intended for applications 5G systems in the Sub-6 GHz band.

Autores
Rafael Alex Vieira Vale (PPgEEC/UFRN)
Isaac B. T. da Silva (Graduate Program in Electrical Engineering, UFERSA)
Antônio Luiz P. de S. Campos (PPgEEC/UFRN)

Synthesis of Dual-Band Convoluted FSS Using Radial Basis Function Neural NetworksResumo: This paper proposes a dual-band...
04/05/2026

Synthesis of Dual-Band Convoluted FSS Using Radial Basis Function Neural Networks

Resumo: This paper proposes a dual-band frequency selective surface (FSS) synthesized with a radial basis function (RBF) neural network. A convoluted unit cell was optimized to operate at the ISM (2.45 GHz) and UNII (5.5 GHz) bands. A database of simulated responses was used to train the RBF model, which achieved accurate parameter prediction with a root-mean-square error of 0.02. The fabricated prototype showed good agreement with simulations, exhibiting dual-band operation, polarization independence, and angular stability. The results confirm the effectiveness of ANN-based synthesis for rapid and efficient FSS design in wireless communication applications.

Autores:
Francisco Carlos G. da Silva Segundo (Departament of Engineering and Technologies, UFERSA)
Alfredo Gomes Neto (Telecommunications and Applied Electromagnetism Group, IFPB)
Antonio Luiz P. S. Campos (PPgEEC/UFRN)

IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026)

Low-Pass Three Layer Frequency Selective SurfaceResumo: This paper proposes and validates a low-pass frequency selective...
28/04/2026

Low-Pass Three Layer Frequency Selective Surface

Resumo:
This paper proposes and validates a low-pass frequency selective surface (FSS) composed of three cascaded layers of rectangular patch elements printed on low-cost FR4 substrates. The multilayer configuration provides a simple and easily manufactured design that achieves a sharp transition between passband and stopband. Full-wave simulations were conducted using ANSYS HFSS, and the prototype was experimentally characterized with a vector network analyzer. The measured cutoff frequencies were approximately 4.98 GHz for vertical polarization and 3.72 GHz for horizontal polarization, showing good agreement with simulation results. The structure maintained angular stability up to 30∘ for vertical and 15° for horizontal polarization. The proposed FSS demonstrates that multilayer low-cost structures can deliver broadband low-pass performance, making them suitable for electromagnetic interference suppression, shielding, and filtering applications.

Autores:
Francisco Carlos G. da Silva Segundo (Departament of Engineering and Technologies, UFERSA),

Alfredo Gomes Neto (Telecommunications and Applied Electromagnetism Group, IFPB)

Antonio Luiz P. S. Campos (PPgEEC/UFRN)

Site do veículo de publicação: https://lacap2026.org/

Parceria entre a UFRN, o IFPB e a UFERSA

Relative Humidity Measurement in 14 cm Thick Concrete BlocksArtigo publicado no IEEE 2nd Latin American Conference on An...
27/04/2026

Relative Humidity Measurement in 14 cm Thick Concrete Blocks

Artigo publicado no IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026).

Resumo: This work presents a microwave system for measuring relative humidity in 14 cm-thick hollow concrete blocks, aiming to establish a technique for structural integrity monitoring. Five block samples were selected for analysis, with a frequency-selective surface (FSS) employed as the sensing element. Two antenna arrays were designed to capture the frequency responses of the blocks combined with the FSS under different humidity levels. The results demonstrate a strong correlation between frequency variation and relative humidity. Numerical processing and statistical analysis enabled the derivation of a second-order function that models the relationship between resonance frequency and relative humidity. A quadratic regression was performed, yielding a function that satisfies the requirements of the proposed study across the full range of 0−100% relative humidity.

Autores:
Juan Rafael Filgueira Guerra (PPgEEC/UFRN)
Humberto Dionísio de Andrade (Department of Engineering and Technology, UFERSA)
Antonio Luiz P. S. Campos (PPgEEC/UFRN)

Parceria entre a UFRN e a UFERSA

Artigo publicado no IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026).This work describes a st...
23/04/2026

Artigo publicado no IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026).

This work describes a structure that achieves simultaneous tri-band absorption and broadband polarization conversion in a single device. The unit cell consists of three square loops and a square patch with a diagonal split, printed on a grounded dielectric substrate and covered by a superstrate, both FR-4. The proposed design offers absorption peaks of 99.98%, 97.6% and 97.6% at frequencies of 1.87GHz,3.3GHz and 4.8 GHz, respectively, while polarization conversion occurs in the Xband, from 8.22 to 9.26 GHz, with a polarization conversion rate above 90% across the entire band. Furthermore, the structure is compact, with dimensions of 0.1λ×0.1λ (length and width) and a thickness equivalent to λ/50.12 at the lowest frequency of absorption.

Autores:
Thayana Mayrink L. de Sousa (Dep. of Telecommunication Engineering, Fluminense Federal University)

Victor M. M. Albuquerque (Dep. of Electrical Engineering, Federal University of Roraima, Boa Vista)

Francisco Diego M. Nobre (Dep. of Electrical Engineering, Federal University of Roraima)

Antônio L. P. S. Campos (PPgEEC/UFRN)

Maurício W. B. Silva (Dep. of Telecommunication Engineering, Fluminense Federal University, Niterói and São Paulo Federal Institute of Education, Science and Technology, Avaré Campus, Avaré, São Paulo)

Parceira entre a UFRN, a UFRR, a UFF e a IFSP

Novo artigo publicado!This paper proposes a frequency-selective surface-based structural health monitoring system for me...
22/04/2026

Novo artigo publicado!

This paper proposes a frequency-selective surface-based structural health monitoring system for measuring relative humidity levels in hollow concrete blocks. The proposed system utilizes designed and built electronic circuits capable of correlating concrete block moisture content to the dB power level of a 2.4 GHz RF measurement signal transmitted through the concrete block and FSS assembly. The methodology, calibration data, and proposed system setup are presented. The results indicate that the system can measure relative humidity levels between 40% and 100%, demonstrating its viability.

Autores:
Lincoln Alexandre Paz Silva (PPgEEC/UFRN)
Isaac B. T. da Silva (UFERSA)
Antônio Luiz P. de S. Campos (PPgEEC/UFRN)

Novo artigo publicado!This work presents the design, simulation, and experimental validation of a high-quality factor mi...
17/04/2026

Novo artigo publicado!

This work presents the design, simulation, and experimental validation of a high-quality factor microwave sensor for measuring the relative permittivity of solid materials. The proposed sensor integrates an interdigital capacitor (IDC) into a rectangular microstrip patch antenna. The sensor achieved a quality factor of 440, a frequency detection resolution (FDR) of 62 MHz, and an average measurement error of only 0.07%. Numerical simulations and equivalent circuit modeling confirm the accuracy of the sensor's behavior, while experimental measurements using five materials under test (MUTs) validate its practical performance.

Autores:
Isau de Sousa Silva (PPgEEC/UFRN)
Ruann V. A. Lira (Department of Engineering and Technology, UFERSA)
Isaac B. T. Da Silva (Department of Engineering and Technology, UFERSA)
Antonio Luiz P. S. Campos (PPgEEC/UFRN)

Veículo: IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026)

Novo artigo publicado!Radio Environment Maps (REMs) provide a structured way to represent spatial signal conditions and ...
16/04/2026

Novo artigo publicado!

Radio Environment Maps (REMs) provide a structured way to represent spatial signal conditions and are increasingly used to support smarter network planning and optimization. In this work, we evaluate an open-source testbed and apply Machine Learning (ML) methods to generate indoor REMs for both uplink and downlink scenarios. The study relies on a 5 G telco-cloud platform that enables scalable data gathering and processing suited to real indoor deployments. After running the measurement data through some ML models and checking their mean squared error (MSE) performance, we observed low error values, indicating that the coverage estimates are trustworthy, especially regarding signal quality classification.

Autores:
Marilia Muniz (PPgEEC/UFRN)
William Nascimento (PPgEEC/UFRN)
Paulo Silva (PPgEEC/UFRN)
Augusto Neto (PPgSC/UFRN)
Antonio Campos (PPgEEC/UFRN)
Vicente Sousa (PPgEEC/UFRN)

Veículo de publicação: IEEE 2nd Latin American Conference on Antennas and Propagation (LACAP 2026)

Link artigo: https://doi.org/10.1109/LACAP67012.2026.11471197

Novo artigo publicado!Autores:Nelson Ion de OliveiraGraduate Program in Systems and Computing (PPgSC), Federal Universit...
08/04/2026

Novo artigo publicado!

Autores:

Nelson Ion de Oliveira
Graduate Program in Systems and Computing (PPgSC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil, Digital Metropolis Institute (IMD), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Flávio de Andrade Silva
Department of Communications Engineering, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Paulo Eduardo da Silva Junior
Graduate Program in Electrical and Computer Engineering (PPgEEC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Ricardo Q. de F. H. Silva
Graduate Program in Electrical and Computer Engineering (PPgEEC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Mathews P. S. Lima
Graduate Program in Systems and Computing (PPgSC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Daniel Rodrigues de Luna
Graduate Program in Systems and Computing (PPgSC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Academic Board (DIAC), Federal Institute of Rio Grande do Norte, Ipanguaçu, Ipanguaçu, Rio Grande do Norte, Brazil

Antonio Luiz Pereira de Siqueira Campos
Department of Communications Engineering, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Graduate Program in Electrical and Computer Engineering (PPgEEC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Augusto Venâncio Neto
Graduate Program in Systems and Computing (PPgSC), Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil

Vicente A. de Sousa
Department of Communications Engineering, Federal University of Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
Graduate Program in Electrical and Computer Engineering (PPgEEC), Federal University of Rio

This paper extends a previously published proposed approach for estimating worst-case exposure scenarios in buildings us...
01/04/2026

This paper extends a previously published proposed approach for estimating worst-case exposure scenarios in buildings using publicly available Base Station (BS) parameters, applying it to a critical case involving a multi-operator shared site. Radiofrequency Electromagnetic Fields (RF-EMF) exposure was assessed on every floor of a 20-story building facing the site, revealing significantly higher levels near the center of the antennas’ estimated vertical zone of interest, with a peak of 31.86 V/m, 23.95 times higher than the street-level peak value. However, due to uncertainties in the input parameters, measurements across all locations within the zone of interest are required to accurately identify the floor of maximum exposure. The results demonstrate the usefulness of the proposed estimation approach and highlight the need for improved methods that consider BS antenna configurations and current technical information to ensure accurate assessments of exposure to RF-EMF.

A história da engenharia no Brasil é construída por mentes dedicadas e incansáveis, e o GppCom tem o orgulho de celebrar...
03/03/2026

A história da engenharia no Brasil é construída por mentes dedicadas e incansáveis, e o GppCom tem o orgulho de celebrar mais um capítulo emocionante dessa narrativa. Hoje, os holofotes se voltam para Júlia da Luz Andrade Silva, uma profissional cuja trajetória inspira e reafirma a excelência da formação na UFRN.

Formada em Engenharia de Telecomunicações pelo CETEL/UFRN e com título de mestra conquistado no Programa de Pós-graduação em Engenharia Elétrica (PPgEEC/UFRN), Júlia é o retrato da dedicação aos estudos e da paixão pela ciência aplicada ao bem-estar da sociedade.

Ciência que Atesta Segurança para os Lares Brasileiros

Durante seu mestrado, Júlia mergulhou em um tema de extrema relevância para o nosso dia a dia. Em sua dissertação, brilhantemente intitulada Medição e Avaliação da Exposição à Radiação Não Ionizante em Ambientes Internos, ela investigou aquilo que muitas vezes gera dúvidas na população: a convivência constante com a tecnologia que usa ondas eletromagnéticas.

O trabalho, desenvolvido em uma prestigiosa parceria com a Agência Nacional de Telecomunicações (ANATEL), trouxe resultados tranquilizadores. Júlia atestou cientificamente a segurança no uso de roteadores Wi-Fi e fornos micro-ondas dentro das nossas residências, comprovando que o vazamento de radiação não ionizante desses equipamentos está perfeitamente dentro dos limites seguros. É a ciência da UFRN impactando diretamente a qualidade de vida e a tranquilidade das famílias brasileiras!

Vocação para Servir: O Ingresso na Marinha do Brasil
A excelência acadêmica de Júlia sempre caminhou lado a lado com um profundo senso de propósito e disciplina. Essa mesma dedicação inabalável aos cadernos e laboratórios pavimentou seu caminho para uma importante conquista: o ingresso na Marinha do Brasil. Lá, ela pôde aplicar seus conhecimentos técnicos com o rigor e o comprometimento que a farda exige, servindo ao país com a mesma garra que demonstrava nas bancadas do GppCom.

O Grande Salto: De Pesquisadora Parceira a Servidora da ANATEL!
Mas as estrelas do GppCom não param de ascender, e a jornada de Júlia guardava um ápice ainda mais espetacular...
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