Raimundo Eider Figueredo, Alexandre M. De Oliveira, Nurhayati Nurhayati, Antonio Mendes De O. Neto, Ingrid C. Nogueira, Joao F. Justo, Marcelo B. Perotoni, Arnaldo De Carvalho
This article presents the modeling of an antipodal Vivaldi antenna (AVA), Palm Tree Class, with radiating fractal slot edge (FSE), in the form of a Koch Square Fractal (SK), labeled as SK-FSE-AVA. The surface currents of the proposed antenna are analyzed, as well as the return loss, directivity, squint, side lobe level (SLL), and Main Lobe (ML) gain. Improvement on directivity is observedwhen compared to an AVA, with 8.41 dB of gain in the main lobe at 4 GHz, SLL of 11.70 dB, and the squint of 0.10°. SK-FSE-AVA has 9.23 dB of gain in the main lobe at 4 GHz, SLL of -13.50 dB, andthe squint of 0.2°. This antenna could be used in ultra-wideband (UWB) systems for applicationson Near-Field Microwave Imaging (NMI). To show the feasibility of this application, a 3D numerical simulation of a model containing lung tissue with a malignant tumor is presented, using the proposed antenna and the respective imaging results. © 2020 IEEE.
Federal Institute of São Paulo, Maxwell Laboratory of Microwaves and Applied Electromagnetism, Cubatão, Suzano, Brazil; Universitas Negeri Surabaya, Department of Electrical Engineering, Surabaya, Indonesia; Christus University Center, Fortaleza, Brazil; Systems Engineering at the Polytechnic School of the University of São Paulo, Department of Electronic, São Paulo, Brazil; ABC Federal University, Santo André, Brazil
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