2026-08-032026-08-032026-07-08TELES, Luis Alexandre Borges. Impacto de fendas em arco simples e dupla no parâmetro S11 de antenas patch circulares. Orientadora: Andrécia Pereira da Costa; Coorientador: Ianes Barbosa Grécia Coutinho. 2026. 53 f. Trabalho de Curso (Bacharelado em Engenharia Elétrica) – Faculdade de Engenharia Elétrica, Campus Universitário de Tucuruí, Universidade Federal do Pará, Tucuruí, 2026. Disponível em: https://bdm.ufpa.br/handle/prefix/9806. Acesso em:.https://bdm.ufpa.br/handle/prefix/9806This work presents an analysis of the impact of single and double arc slots on the S11 parameter of circular patch microstrip antennas. The reference antenna was dimensioned to operate in the TM11 mode at 2.4 GHz, with radius R ≈ 16.98 mm, on an FR-4 substrate with relative permittivity εr = 4.4, loss tangent tan δ ≈ 0.02 and thickness h = 1.5 mm. The feeding was implemented using a quarter-wavelength (λ/4) transformer composed of a main line with width W1D = 5 mm, a narrow section of W1H = 1.5 mm and total length L1 = 31.17 mm. Four configurations were simulated in Ansys HFSS: without slot (reference), with a left arc slot, with a right arc slot and with two arc slots. The slots were modeled as arcs with length Lc = 16.59 mm, width Wc = 1.73 mm, radius Rs = Rd = 13, 63 mm and central angle θ = 60◦. The reference configuration resonated at 2.42 GHz (S11 = −37 dB) and 4.84 GHz (S11 = −14 dB). The left-slot configuration enabled three operating bands: 2.38 GHz, 4.62 GHz and 5.41 GHz. The configuration with the slot on the right exhibited responses similar to those measured with the slot positioned on the left. The dual-slot configuration showed the best multiband performance, with resonances at 2.12 GHz (S11 = −16.73 dB) and 5.05 GHz (S11 = −30.84 dB). The dual-slot prototype was fabricated at the Digital Fabrication Laboratory (FABLAB) of the University Campus of Tucuruí (CAMTUC), Federal University of Pará (UFPA), using CNC laser cutting, and experimentally characterized at the Device Synthesis and Main-tenance Laboratory (SMDLab) with the portable LiteVNA-64 Vector Network Analyzer (VNA), calibrated using the SOL technique. Experimental results confirmed the multiband behavior with resonances at 2.01 GHz (S11 = −15.03 dB) and 5.13 GHz (S11 = −18.86 dB), VSWR of 1.43 and 1.25, and bandwidths of 50 MHz and 120 MHz, respectively. Deviations between simulation and measurement were 5.19% and 1.58%. The good agreement validates the adopted methodology and demonstrates that arc slots are an effective alternative for designing compact multiband antennas suitable for Wi-Fi and IoT applications.Acesso AbertoAntena patch circularFendas em arcoMicrofitaMultibandaS11HFSSLiteVNA-64Circular patch antennaArc slotsMicrostripMultibandCNPQ::ENGENHARIAS::ENGENHARIA ELETRICA::TELECOMUNICACOES::TEORIA ELETROMAGNETICA, MICROONDAS, PROPAGACAO DE ONDAS, ANTENASTrabalho de Curso - Graduação - MonografiaAttribution-NonCommercial-NoDerivs 3.0 Brazil