Alexandre Manicoba De Oliveira, Antonio Mendes De Oliveira Neto, Marcelo Bender Perotoni, N. Nurhayati, Henri Baudrand, Arnaldo De Carvalho, Joao Francisco Justo
This investigation presents an oval slot edge (OSE) antipodal Vivaldi antenna (AVA), hereinafter referred to as Fern AVA (FAVA), with an optimized radiation pattern. The use of OSE provided improvements in the antenna characteristics, especially regarding a lower frequency limit reduction, an increase in the main lobe (ML) gain, and the sidelobe level (SLL) reduction. Those contrasting characteristics are simultaneously obtained through the class of the Palm Tree antennas. The proposed FAVA at 1.5 GHz shows an improved gain of 6.66 dB, -12.9 dB of SLL, and 0° of ML squint (MLS), in contrast with 4.41 dB of gain, -4.5 dB of SLL, and 4° of MLS in the conventional AVA. For the FAVA, the notches in an elliptical shape, in addition to mitigating the SLL, direct the {E} -fields distributions toward the ML, which categorizes it into the same class as the Palm Tree Vivaldi Antenna. To study the performance of the proposed antenna for medical applications of near-field microwave imaging, a conceptual proof was performed, thus obtaining the microwave image of a Child Head Phantom, homogeneous, and semirealistic, being possible to detect a brain tumor. © 1963-2012 IEEE.
Laboratorio James Clerk Maxwell de Micro-ondas e Eletromagnetismo Aplicado (LABMAX), Instituto Federal de Educacao, Ciencia e Tecnologia de Sao Paulo, Cubatao, Brazil; Federal University of ABC, Santo Andre, Brazil; Department of Electrical Engineering, Faculty of Engineering, Universitas Negeri Surabaya, Surabaya, Indonesia; National Polytechnic Institute of Toulouse, Toulouse, France; Escola Politecnica, Universidade de Sao Paulo, Sao Paulo, Brazil
