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Papers by Giovani Bulla

Research paper thumbnail of PIFA bandwidth optimization using genetic algorithm and capacitive feeding

... Giovani Bulla*(1,2), Alvaro AA de Salles(1) and Tan Phu Vuong(2) (1)Electrical Engineering De... more ... Giovani Bulla*(1,2), Alvaro AA de Salles(1) and Tan Phu Vuong(2) (1)Electrical Engineering Department, Federal University of ... 1606-1614 [4] G. Bulla, G., AA de Salles, TP Vuong, “PIFA Bandwidth Optimization Using Genetic Algorithm", Proc. ... [8] R. Feick, H. Carrasco, M. Olmos ...

Research paper thumbnail of Electromagnetic Absorption in the Head of Adults and Children Due to Mobile Phone Operation Close to the Head

Electromagnetic Biology and Medicine, 2006

The Specific Absorption Rate (SAR) produced by mobile phones in the head of adults and children i... more The Specific Absorption Rate (SAR) produced by mobile phones in the head of adults and children is simulated using an algorithm based on the Finite Difference Time Domain (FDTD) method. Realistic models of the child and adult head are used. The electromagnetic parameters are fitted to these models. Comparison also are made with the SAR calculated in the children model when using adult human electromagnetic parameters values. Microstrip (or patch) antennas and quarter wavelength monopole antennas are used in the simulations. The frequencies used to feed the antennas are 1850 MHz and 850 MHz. The SAR results are compared with the available international recommendations. It is shown that under similar conditions, the 1g-SAR calculated for children is higher than that for the adults. When using the 10-year old child model, SAR values higher than 60% than those for adults are obtained.

Research paper thumbnail of Shorting pins application in wide-band E-shaped patch antenna

Research paper thumbnail of Comparison of electromagnetic absorption characteristics in the head of adult and a children for 1800 MHz mobile phones

Research paper thumbnail of Optimization of E-shaped patch antenna

Microwave and Optical Technology Letters, 2010

Bandwidth, size and polarization optimizations of a single layer wide-band full and half E-shaped... more Bandwidth, size and polarization optimizations of a single layer wide-band full and half E-shaped patch antenna fed through a coaxial probe are described. The finite-difference time-domain (FDTD) method was used in the simulations. Measurements and simulations using capacitive feeding and shorting pins are presented. Using these techniques, the bandwidth can be improved up to 32% and the antenna area can be reduced up to 60% without significant change in the frequency band. Using four raised conducting walls on edges of the ground plane, the cross-polarization level is improved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1556–1561, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25227

Research paper thumbnail of PIFA bandwidth optimization using genetic algorithm and capacitive feeding

... Giovani Bulla*(1,2), Alvaro AA de Salles(1) and Tan Phu Vuong(2) (1)Electrical Engineering De... more ... Giovani Bulla*(1,2), Alvaro AA de Salles(1) and Tan Phu Vuong(2) (1)Electrical Engineering Department, Federal University of ... 1606-1614 [4] G. Bulla, G., AA de Salles, TP Vuong, “PIFA Bandwidth Optimization Using Genetic Algorithm", Proc. ... [8] R. Feick, H. Carrasco, M. Olmos ...

Research paper thumbnail of Electromagnetic Absorption in the Head of Adults and Children Due to Mobile Phone Operation Close to the Head

Electromagnetic Biology and Medicine, 2006

The Specific Absorption Rate (SAR) produced by mobile phones in the head of adults and children i... more The Specific Absorption Rate (SAR) produced by mobile phones in the head of adults and children is simulated using an algorithm based on the Finite Difference Time Domain (FDTD) method. Realistic models of the child and adult head are used. The electromagnetic parameters are fitted to these models. Comparison also are made with the SAR calculated in the children model when using adult human electromagnetic parameters values. Microstrip (or patch) antennas and quarter wavelength monopole antennas are used in the simulations. The frequencies used to feed the antennas are 1850 MHz and 850 MHz. The SAR results are compared with the available international recommendations. It is shown that under similar conditions, the 1g-SAR calculated for children is higher than that for the adults. When using the 10-year old child model, SAR values higher than 60% than those for adults are obtained.

Research paper thumbnail of Shorting pins application in wide-band E-shaped patch antenna

Research paper thumbnail of Comparison of electromagnetic absorption characteristics in the head of adult and a children for 1800 MHz mobile phones

Research paper thumbnail of Optimization of E-shaped patch antenna

Microwave and Optical Technology Letters, 2010

Bandwidth, size and polarization optimizations of a single layer wide-band full and half E-shaped... more Bandwidth, size and polarization optimizations of a single layer wide-band full and half E-shaped patch antenna fed through a coaxial probe are described. The finite-difference time-domain (FDTD) method was used in the simulations. Measurements and simulations using capacitive feeding and shorting pins are presented. Using these techniques, the bandwidth can be improved up to 32% and the antenna area can be reduced up to 60% without significant change in the frequency band. Using four raised conducting walls on edges of the ground plane, the cross-polarization level is improved. © 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 1556–1561, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.25227

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